Invalid regular expression flag s or invalid token error in ES6 or ECMA script?

Question

code :
function printManyTimes (str) {
"use strict";
const SENTENCE = str + " is cool!";

for(let i=0; i<str.length; i+=2){
console.log(SENTENCE);
}

}

printManyTimes("xyz");

Answer 1

Your code works fine for me.

Calviղ A const can definitely equal a variable, it's just that you may only assign to it once.

Answer 2

const must be a constant, cannot equal to a variable. Use let insteads.

Answer 3

`var` and `let` create variable names which can be overwritten.
let mystr = "spam";
mystr = "eggs"; // reassigns!

`const` makes a variable name that stays pointing to that value. Changing it causes an error to be thrown.
const mystr = "123";
mystr = "456"; // ERROR!

What `const` does allow is if it was set to an object, that object still can be manipulated by its properties & methods.
const arr = [1, 2, 3];
arr.push(4, 5, 6);
console.log(arr); // 1,2,3,4,5,6
arr.length = 2;
console.log(arr); // 1,2

The usefulness of `const` is when it should never be reassigned while `var` (and its new `let`) can be reassigned, hence the names "constant" and "variable".