Js Map Array. Convert 2D array to object using map or reduce in JavaScript. If youve worked with JavaScript for a little while youve probably come across two seemingly similar Array methods.
The function map in Javascript ES6. MapprototypeforEachcallbackFn thisArg Calls callbackFn once for each key-value pair present in the Map object in insertion order. Useful JavaScript Map methods.
Mapprototypeentries Returns a new Iterator object that contains an array of key value for each element in the Map object in insertion order.
It creates a new array without modifying the elements of the original array. Here is a fun summary by Steven Luscher. Useful JavaScript Map methods. If youre starting in JavaScript maybe you havent heard of map reduce and filterFor me it took a while as I had to support Internet Explorer 8 until a couple years ago.
