JS: String.prototype.padEnd

New in JS2017.

str.padEnd(n)

Return a new string, by adding space to the end of string so the length is n.

str.padEnd(n, padstr)

Use padStr to pad.

console.log( "x".padEnd(3) === "x  ");
console.log( "x".padEnd(3, "0") === "x00");
console.log( "x".padEnd(4, "ab") === "xaba");
// true

Note: "😂".length === 2 [see JS: String Code Unit]