vfpe

I write in CofeeScript and new JavaScript (ES6) as well. I found myself stuck every time when I need to write a simple iteration throught an array or object. Why? Well, probably because the definition is totally opposite in these languages. Here are notes and code examples to clear it up:   JavaScript (ES6) The for–in loop is for looping over object properties.  The for–of loop is for looping over data—like the values in an array . From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of const array1 = ['a', 'b', 'c']; for (const element of array1) { console.log(element); } // expected output: "a" // expected output: "b" // expected output: "c" From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in const object = { a: 1, b: 2, c: 3 }; for (const property in object) { console.log(`${property}: ${object[property]}`); } // expected output: // "...