Javascript Array Map Index. Otherwise it will return -1 which indicates that no element passed the test. The array map method accepts the first parameter as a function and that function accepts the following three parameters.
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The difference between the two is that the map method creates and returns a new array based on the result of the provided callback function. Map does not execute the function for array elements without values. The callback function takes up 3 arguments.
It is a non-mutating method.
Here are a few things that you should remember about Arraymap. The method is called for every element of the array and the result of the operation is mapped to the corresponding index in the new array. The JavaScript map method returns a newly created array with the results of invoking the callback function on each element of the array. The map method in JavaScript creates an array by calling a specific function on each element present in the parent array.
