Creating custom function on JavaScript String startsWith and endsWith

if (typeof String.prototype.startsWith != 'function') {
                String.prototype.startsWith = function(str) {
                    return this.slice(0, str.length) == str;

if (typeof String.prototype.endsWith != 'function') {
                String.prototype.endsWith = function(str) {
                    return this.slice(-str.length) == str;

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