Would you please help me to know about the LOOP, how we got the 'arguments'?

Question

function containsAll(arr) {
for (let k = 1; k < arguments.length; k++) {
let num = arguments[k];
if (arr.indexOf(num) === -1) {
return false;
}
}
return true;
}

let x = [2, 4, 6, 7];
console.log(containsAll(x, 2, 4, 7));
console.log(containsAll(x, 6, 4, 9));

Answer 1

In JS, 'arguments' is a local variable within functions, which you can use to access the arguments you have passed to a function. It is an implicitly-declared binding, which means that you don't have to declare it yourself to use it.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments

Answer 2

Hatsy Rei Thank you so much.. :)

Answer 3

Hatsy Rei again needed to know, why here is used let variable's 'x' as expression in the console to print out the output ?