ES6 Map, Filter, Reduce

Question 1

array.map( )

Answer 1

Receives a function as a parameter (a callback function). The callback function is getting executed on each element of the array, one by one.

Question 2

array.filter( )

Answer 2

returns a new array, if the callback function returns true, the current element will be in the resulting array. If it returns false, it won’t be.

Question 3

array.reduce( )

Answer 3

generates a single value or object from an array. the two parameters used in the callback function are respectively the so called accumulator and the current element.