Thisarg Of Array.foreach Does Not Reference As Expected

Given following code: const theArray = ['Audi','Volvo','Mercedes']; const myObj = {a: 7}; theArray.forEach((value, index, array) => { console.log(index + ' : ' + value);

Solution 1:

Problem

Arrow functions:

An arrow function expression has a shorter syntax compared to function expressions and lexically binds the this value (does not bind its own this, arguments, super, or new.target). Arrow functions are always anonymous.

Solution 1

Use function

const theArray = ['Audi','Volvo','Mercedes'];

const myObj = {a: 7};

theArray.forEach(function (value, index, array) {
    console.log(index + ' : ' + value);
    console.log(array === theArray);
    console.log(this.a);
}, myObj);

Solution 2

Use a closure

var abc = 'abc';
const theArray = ['Audi','Volvo','Mercedes'];

const myObj = {a: 7};

theArray.forEach((obj =>(value, index, array) => {
    console.log(index + ' : ' + value);
    console.log(array === theArray);
    console.log(obj.a);
    console.log(this.abc);
})(myObj));