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tkatochin/AddToStringPrototypeStartsWithAndEndsWith.js

Last active December 22, 2015 06:59
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Stringの startsWith, endsWith
Raw
AddToStringPrototypeStartsWithAndEndsWith.js
String.prototype.startsWith = function(prefix) {
return this.lastIndexOf(prefix, 0) == 0;
};
String.prototype.endsWith = function(suffix) {
return this.lastIndexOf(suffix) == this.length-suffix.length;
}
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