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I have gone through the map and filter functionalities and got to know that there is some kind of differences and advantages over for and foreach.
Advantages:
No need to write too much of code and very clear understanding
Better performance compare to iteration
how map and filter will be the better performance ?
appreciate any kind of suggestions.
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The main difference between forEach and filter is that forEach just loop over the array and executes the callback but filter executes the callback and check its return value.
The returning value The first difference between map() and forEach() is the returning value. The forEach() method returns undefined and map() returns a new array with the transformed elements. Even if they do the same job, the returning value remains different.
map creates a new array by transforming every element in an array individually. filter creates a new array by removing elements that don't belong. reduce , on the other hand, takes all of the elements in an array and reduces them into a single value. Just like map and filter , reduce is defined on Array.
The main difference between forEach and map method is that forEach method just loop through the array and doesn't return anything. While, map returns a new array. We can use map to create a deep copy of an array.
Clear explanation about performance and differences of for, for each, map and filters freeCodeCamp
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