What is the difference between "forEach", "for...in" and "for...of"?

Question

My english is not helping me and the translation is too bad... 😅
https://codeburst.io/javascript-the-difference-between-foreach-and-for-in-992db038e4c2

Answer 1

for in is getting the keys of an object, index if it is array.

https://code.sololearn.com/WyWx8udHdDjn/?ref=app

for of is getting the array elements

https://code.sololearn.com/WX2CwmYR8lIo/?ref=app

forEach is an Array method which accepts an argument which is a function with element and index as parameter.

https://code.sololearn.com/WbfJmVR5cCsA/?ref=app

Answer 2

Alex Tusinean

The forEach() method calls a function once for each element in an array, in order.
In other words - forEach element of the array, pass that element to a function.

https://www.w3schools.com/jsref/jsref_foreach.asp

https://code.sololearn.com/Wcik1RThrFeu/#js

Answer 3

I understand now what is for...in , and for...of, but I still don't understand forEach. 😅

Answer 4

JS is getting quite cryptic these days, isn't it?

Answer 5

forEach is a method from array.prototype, this method accept a argument, an callback function with tow argunents: item element and index element. This method is almost same at map method

for...in and for...of are the control structure syntax, this syntax allow iterate an array, the diference is in for...in return the index and for...of return the element

https://code.sololearn.com/Wi71QLk9Igi7/?ref=app