vadim9999
commented
6 years ago I have learned about for-in and for-of loops.
The for-in loop is for looping over object properties.
The for-of loop is for looping over data.(value in array).
The forEach is used in arrays.
var list = [1,3,5]; list.forEach(function(value,index){ console.log(value); })
With for-of you can looping Set,Map, strongly recommended for Array.
for-of is great because you can use in block code "return" "break" or "continue", but you don't do that in forEach.
iterator
const array =['foo','bar','zed'];
const iterator = array[Symbol.iterator](); function return iterator with whom we can extract data from array.
iterator.next() This function next() returns an object with properties value and done.
Classification of loops
Loops are Definite and Indefinit. Definite loop(for, for-in,for-of) are used to execute code certain times.
Indefinit loops (while,do-while) are used to execute code when condition will be true, it's stops when it will be false.
Loop Control statements: continue, label, break.
atherdon
https://hacks.mozilla.org/2015/04/es6-in-depth-iterators-and-the-for-of-loop/ https://www.tutorialspoint.com/es6/es6_loops.htm http://www.benmvp.com/learning-es6-for-of-loop/ https://gomakethings.com/looping-through-arrays-the-es6-way/