Understanding Map, Filter and Reduce in JavaScript

Understanding Map, Filter and Reduce in JavaScript

What are .map(), .filter(), and .reduce()? Map, reduce, and filter are all array methods in JavaScript. Map, filter, and reduce are three higher-order functions in JavaScript. The map() method creates a new array with the results of calling a provided function on every element in the calling array. The filter() method creates a new array with all elements that pass the condition implemented by the provided function. The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.

Understanding map, filter and reduce in JavaScript

What are .map(), .filter(), and .reduce()?

Map, filter, and reduce are three higher-order functions (functions that either take in other functions as arguments or return other functions) in JavaScript.

Map

The map() method creates a new array with the results of calling a provided function on every element in the calling array.

Filter

The filter() method creates a new array with all elements that pass the condition implemented by the provided function.

Reduce

The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.

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