Abstract Readonly [unscopables]An Object whose truthy properties are properties that are excluded from the 'with' environment bindings of the associated objects.
Optional [iterator]?: booleanOptional Readonly [unscopables]?: booleanOptional at?: booleanOptional concat?: booleanOptional copyOptional entries?: booleanOptional every?: booleanOptional fill?: booleanOptional filter?: booleanOptional find?: booleanOptional findOptional flat?: booleanOptional flatOptional forOptional includes?: booleanOptional indexOptional join?: booleanOptional keys?: booleanOptional lastOptional length?: booleanOptional map?: booleanOptional pop?: booleanOptional push?: booleanOptional reduce?: booleanOptional reduceOptional reverse?: booleanOptional shift?: booleanOptional slice?: booleanOptional some?: booleanOptional sort?: booleanOptional splice?: booleanOptional toOptional toOptional unshift?: booleanOptional values?: booleanThe number of values.
An Error as the length property cannot be assigned.
Whether null is a valid value for the collection.
Whether null is a valid value for the collection.
Name of the type of items.
The name of the type of values.
Add a listener callback which will be called when a live collection instance changes.
A function to be called when changes occur.
Optional keyPaths: string | string[]Indicates a lower bound on the changes relevant for the listener. This is a lower bound, since if multiple listeners are added (each with their own keyPaths) the union of these key-paths will determine the changes that are considered relevant for all listeners registered on the collection. In other words: A listener might fire more than the key-paths specify, if other listeners with different key-paths are present.
deletions and oldModifications report the indices in the collection before the change happened,
while insertions and newModifications report the indices into the new version of the collection.
A TypeAssertionError if callback is not a function.
wines.addListener((collection, changes) => {
// collection === wines
console.log(`${changes.insertions.length} insertions`);
console.log(`${changes.oldModifications.length} oldModifications`);
console.log(`${changes.newModifications.length} newModifications`);
console.log(`${changes.deletions.length} deletions`);
console.log(`new size of collection: ${collection.length}`);
});
wines.addListener((collection, changes) => {
console.log("A wine's brand might have changed");
}, ["brand"]);
Adding the listener is an asynchronous operation, so the callback is invoked the first time to notify the caller when the listener has been added.
Thus, when the callback is invoked the first time it will contain empty arrays for each property in the changes object.
The element at the given index in the array; undefined if there is no element at the given index.
index - The index of the element to return from the array. If the index is a negative number, the element at array.length + index is returned.
Computes the average of the values in the collection or of the given
property among all the objects in the collection, or undefined if the collection
is empty.
Only supported for int, float and double properties. null values are
ignored entirely by this method and will not be factored into the average.
Optional property: stringFor a collection of objects, the property to take the average of.
The sum.
An Error if no property with the name exists or if property is not numeric.
Rest ...items: ConcatArray<T>[]Arrays and/or values to concatenate into a new array.
A new array with the results of calling a provided function on every element in this array.
A new array with the results of calling a provided function on every element in this array.
true if the callback function returns a truthy value for every collection element; otherwise, false.
predicate - A function to test for each element.
predicate.value - The current element being processed in the collection.
predicate.index - The index of the current element being processed in the collection.
predicate.array - The collection every was called upon.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Optional thisArg: anytrue if the callback function returns a truthy value for every collection element; otherwise, false.
predicate - A function to test for each element.
predicate.value - The current element being processed in the collection.
predicate.index - The index of the current element being processed in the collection.
predicate.array - The collection every was called upon.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
A new array containing the elements of the collection for which the predicate function returned true.
predicate - A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the collection.
predicate.value - The current element being processed in the collection.
predicate.index - The index of the current element being processed in the collection.
predicate.array - The collection filter was called upon.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Optional thisArg: anyA new array containing the elements of the collection for which the predicate function returned true.
predicate - A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the collection.
predicate.value - The current element being processed in the collection.
predicate.index - The index of the current element being processed in the collection.
predicate.array - The collection filter was called upon.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Returns new Results that represent this collection being filtered by the provided query.
Query used to filter objects from the collection.
Rest ...args: unknown[]Each subsequent argument is used by the placeholders
(e.g. $0, $1, $2, …) in the query.
Results filtered according to the provided query.
An Error if the query or any other argument passed into this method is invalid.
This is currently only supported for collections of Realm Objects.
let merlots = wines.filtered('variety == "Merlot" && vintage <= $0', maxYear);
The value of the first element in the array that satisfies the provided testing function. Otherwise, undefined is returned.
predicate - A function that accepts up to three arguments. The find method calls the predicate function one time for each element in the collection.
predicate.value - The value of the element.
predicate.index - The index of the element.
predicate.obj - The object being traversed.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Optional thisArg: anyThe value of the first element in the array that satisfies the provided testing function. Otherwise, undefined is returned.
predicate - A function that accepts up to three arguments. The find method calls the predicate function one time for each element in the collection.
predicate.value - The value of the element.
predicate.index - The index of the element.
predicate.obj - The object being traversed.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Optional thisArg: anyThe index of the first element in the array that satisfies the provided testing function. Otherwise, -1 is returned.
predicate - A function that accepts up to three arguments. The findIndex method calls the predicate function one time for each element in the collection.
predicate.value - The value of the element.
predicate.index - The index of the element.
predicate.obj - The object being traversed.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
A new array with each element being the result of the callback function and flattened to a depth of 1.
callback - Function that produces an element of the new Array, taking three arguments:
callback.currentValue - The current element being processed in the array.
callback.index - The index of the current element being processed in the array.
callback.array - The array flatMap was called upon.
thisArg - Value to use as this when executing callback.
Optional thisArg: anycallbackfn - A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the collection.
callbackfn.value - The current element being processed in the collection.
callbackfn.index - The index of the current element being processed in the collection.
callbackfn.array - The collection forEach was called upon.
thisArg - An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
Optional fromIndex: numbertrue if the searchElement is found in the array; otherwise, false.
searchElement - The element to search for.
fromIndex - The position in this array at which to begin searching for searchElement. A negative value searches from the index of array.length + fromIndex by asc.
fromIndex is currently not supported. So all searches start at index 0.
Optional fromIndex: numberThe first index at which a given element can be found in the collection, or -1 if it is not present.
searchElement - Element to locate in the collection.
fromIndex - The collection index at which to begin the search. If omitted, the search starts at index 0.
fromIndex is currently not supported. So all searches start at index 0.
Abstract isOptional fromIndex: numberThe last index at which a given element can be found in the collection, or -1 if it is not present. The collection is searched backwards, starting at fromIndex.
searchElement - Element to locate in the collection.
fromIndex - The collection index at which to begin the search. If omitted, the search starts at the last index.
A new array containing the results of calling the callbackfn function on each element in the collection.
callbackfn - A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the collection.
callbackfn.value - The current element being processed in the collection.
callbackfn.index - The index of the current element being processed in the collection.
callbackfn.array - The collection map was called upon.
thisArg - An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
Returns the maximum value of the values in the collection or of the
given property among all the objects in the collection, or undefined
if the collection is empty.
Only supported for int, float, double and date properties. null values
are ignored entirely by this method and will not be returned.
Optional property: stringFor a collection of objects, the property to take the maximum of.
The maximum value.
An Error if no property with the name exists or if property is not numeric/date.
Returns the minimum value of the values in the collection or of the
given property among all the objects in the collection, or undefined
if the collection is empty.
Only supported for int, float, double and date properties. null values
are ignored entirely by this method and will not be returned.
Optional property: stringFor a collection of objects, the property to take the minimum of.
The minimum value.
A TypeAssertionError if no property with the name exists or if property is not numeric/date.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduce was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduce was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduce was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduceRight was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduceRight was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
The value that results from the reduction.
callbackfn - A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the collection.
callbackfn.previousValue - The value previously returned in the last invocation of the callbackfn function, or initialValue, if supplied. (See below.)
callbackfn.currentValue - The current element being processed in the collection.
callbackfn.currentIndex - The index of the current element being processed in the collection.
callbackfn.array - The collection reduceRight was called upon.
initialValue - If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an element value.
Remove the listener callback from the collection instance.
Callback function that was previously added as a listener through the Collection.addListener method.
a TypeAssertionError If callback is not a function.
Optional start: numberOptional end: numberA new array containing the elements between the start and end indices.
start - Zero-based index at which to begin extraction.
end - Zero-based index at which to end extraction. It extracts up to but not including end.
Create a frozen snapshot of the collection.
Values added to and removed from the original collection will not be reflected in the Results returned by this method, including if the values of properties are changed to make them match or not match any filters applied.
This is not a deep snapshot. Realm objects contained in this
snapshot will continue to update as changes are made to them, and if
they are deleted from the Realm they will be replaced by null at the
respective indices.
Results which will not live update.
Optional thisArg: anytrue if the callback function returns a truthy value for any collection element; otherwise, false.
predicate - A function to test for each element.
predicate.value - The current element being processed in the collection.
predicate.index - The index of the current element being processed in the collection.
predicate.array - The collection every was called upon.
thisArg - An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
Returns new Results that represent a sorted view of this collection.
A collection of Realm Objects can be sorted on one or more properties of
those objects, or of properties of objects linked to by those objects.
To sort by a single property, simply pass the name of that property to
sorted(), optionally followed by a boolean indicating if the sort should be reversed.
For more than one property, you must pass an array of
sort descriptors which list
which properties to sort on.
Collections of other types sort on the values themselves rather than properties of the values, and so no property name or sort descriptors should be supplied.
Optional reverse: booleanSort in descending order rather than ascended.
It may not be applied if descriptor is an array of sort descriptors.
Results sorted according to the arguments passed in.
An Error if a specified property does not exist.
Returns new Results that represent a sorted view of this collection.
A collection of Realm Objects can be sorted on one or more properties of
those objects, or of properties of objects linked to by those objects.
To sort by a single property, simply pass the name of that property to
sorted(), optionally followed by a boolean indicating if the sort should be reversed.
For more than one property, you must pass an array of
sort descriptors which list
which properties to sort on.
Collections of other types sort on the values themselves rather than properties of the values, and so no property name or sort descriptors should be supplied.
The property name(s) to sort the collection on.
Results sorted according to the arguments passed in.
An Error if a specified property does not exist.
Returns new Results that represent a sorted view of this collection.
A collection of Realm Objects can be sorted on one or more properties of
those objects, or of properties of objects linked to by those objects.
To sort by a single property, simply pass the name of that property to
sorted(), optionally followed by a boolean indicating if the sort should be reversed.
For more than one property, you must pass an array of
sort descriptors which list
which properties to sort on.
Collections of other types sort on the values themselves rather than properties of the values, and so no property name or sort descriptors should be supplied.
The property name(s) to sort the collection on.
Optional reverse: booleanResults sorted according to the arguments passed in.
An Error if a specified property does not exist.
Computes the sum of the values in the collection or of the given property among all the objects in the collection, or 0 if the collection is empty.
Only supported for int, float and double properties. null values are
ignored entirely by this method.
Optional property: stringFor a collection of objects, the property to take the sum of.
The sum.
An Error if no property with the name exists or if property is not numeric.
The plain object representation for JSON serialization. Use circular JSON serialization libraries such as @ungap/structured-clone and flatted to stringify Realm entities that have circular structures.
An array of plain objects.
An iterator with all values in the collection.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values | Array.prototype.values()}
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An OrderedCollection is a homogenous sequence of values of any of the types that can be stored as properties of Realm objects. It can be accessed in any of the ways that a normal JavaScript Array can, including subscripting, enumerating with
for-ofand so on.See
Array