JavaScript: String.prototype.endsWith

New in JS2015.

str.endsWith(searchString)

Return true if str end with searchString. Else, return false.

str.endsWith(searchString, endPosition)

Use index endPosition as the end of string.

endPosition is negative, count from right.

const ss = "abcd";

console.log( ss.endsWith("cd") ); // true
console.log( ss.endsWith("cd", 4) ); // true
console.log( ss.endsWith("a", 1) ); // true
console.log( ss.endsWith("ab", 2) ); // true

console.log( ss.endsWith("b") );  // false
console.log( ss.endsWith("bc", 2) ); // false