Js Map Return New Object
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Js Map Return New Object
The keys () returns a new iterator object that contains the keys of elements in the map. Set() sets the value for a key in a map: Map () calls a function once for each element in an array.
Returns a new iterator object that contains the values for each element in the map object in insertion order. @amberlamps your.reduce example is ok, but imho it still falls a long way short of the convenience of a.map for objects, since your.reduce callback not only has to match the way that.reduce works, but also requires that myobject be available in the lexical scope. Modified 5 years, 7 months ago.
Syntax var new_array = arr.map (function callback (element, index, array) { // return value for new_array } [, thisarg]) in the callback, only the array element is required.
A previous tutorial showed you how to create a javascript map instance from an existing object. Map.prototype.foreach ( callbackfn [, thisarg ]) New map() creates a new map: The following code takes an array of numbers and creates a new array containing the square roots of the numbers in the first array.
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