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Allow extension of functions that may not be defined

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Toby Zerner
2015-08-05 19:20:49 +09:30
parent 4c06e78b57
commit f182689c90
1 changed files with 1 additions and 1 deletions
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js/lib/extend.js
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@ -22,7 +22,7 @@ export function extend(object, method, callback) {
const original = object[method]; const original = object[method];
object[method] = function(...args) { object[method] = function(...args) {
const value = original.apply(this, args); const value = original ? original.apply(this, args) : undefined;
callback.apply(this, [value].concat(args)); callback.apply(this, [value].concat(args));