Javascript Map Object Example
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Javascript Map Object Example
Instance properties map.prototype.size returns the number of key/value pairs in the map object. It creates a new array without modifying the elements of the original array. Following is the code for map object in javascript − example live demo
And due to the uniqueness of each stored key, there is no duplicate pair stored. 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. It returns a map object
From this example, you can notice that they are not converted to strings, as any type.
And due to the uniqueness of each stored key, there is no duplicate pair stored. That is it for javascript map object. Instance properties map.prototype.size returns the number of key/value pairs in the map object. The javascript map method is used to call a function on each element of an array to create a different array based on the outputs of the function.
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