Javascript

Question 1

loop through and object with for…each

Answer 1

for each(var in obj){}

ps: for each is obsolete, for(var of obj) is preferred, but Array.prototype.forEach() is still used.

Question 2

one difference between for() and Array.prototype.forEach()

Answer 2

you can break; in the middle of a for loop;
forEach spares you of writting the iteration conditions, making it less error prone;
forEach has more readability

Question 3

JSON.parse vs JSON.stringify

Answer 3

JSON.parse: converts a json file into a js object

JSON.stringify: get a JS object and converts into string format.

Question 4

getting the directory name instead of the file name in:

C:\User\Desktop\Folder\file.js

Answer 4

path.dirname(‘path’);

Question 5

Calling multiple promisses with one function

Answer 5

Promisse.all([func1, func2, func3. …]).then()