Map An Array Javascript
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Map An Array Javascript
New map() creates a new map: I have a constructor in javascript which contains 2 properties key and values array: Map is a collection of keyed data items, just like an object.
Has() returns true if a key exists in a map: */ }) map((element, index) => { /*. Delete() removes a map element specified by the key:
The grouptomap() method groups the elements of the calling array using the values returned by a provided testing function.
We will use the for in loop to grab the object and iterate it. To call filter to return an array with all the items with selected set to true. After the function is called on the last element in the array, the value of accumulator is returned as the return value of reduce. Generally map () method is used to iterate over an array and calling function on every element of array.
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