JS: String.prototype.startsWith

By Xah Lee. Date: 2017-02-17. Last updated: 2020-09-12.

New in JS2015.

str.startsWith(searchString): Return true if str starts with searchString. Else, return false.
str.startsWith(searchString, position): Check if start from position.

const ss = "abcd";

console.log(ss.startsWith("ab"));
console.log(ss.startsWith("b") === false);

console.log(ss.startsWith("b", 1));