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A Map is a collection of key/value pairs that can use any data type as a key and can maintain the order of its entries. padding-left : 20px; .

The map() method will call the circleArea function on each element of the circles array and return a new array with the elements that have been transformed. text-align : left; First, let’s initialize a map with non-string keys: This example will override the first key of 1 with the subsequent one, and it will treat '1' the string and 1 the number as unique keys: Although it is a common belief that a regular JavaScript Object can already handle Numbers, booleans, and other primitive data types as keys, this is actually not the case, because Objects change all keys to strings. } Javascript Map vs Object — What and when? The method will return a Boolean—true if an item existed and was deleted, and false if it did not match any item. One particular benefit Maps have over Objects is that you can find the size of a Map at any time, like you can with an Array. The important thing to note here is that objects can also be used as keys in maps… In ES6 you can do it like this: (assume your Map object is m). font-style : normal; background-color : aliceblue;