25 lines
727 B
Markdown
25 lines
727 B
Markdown
### bindKey
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Creates a function that invokes the method at a given key of an object, optionally adding any additional supplied parameters to the beginning of the arguments.
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Return a `function` that uses `Function.apply()` to bind `context[fn]` to `context`.
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Use `Array.concat()` to prepend any additional supplied parameters to the arguments.
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```js
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const bindKey = (context, fn, ...args) =>
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function() {
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return context[fn].apply(context, args.concat(...arguments));
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};
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```
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```js
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const freddy = {
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user: 'fred',
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greet: function(greeting, punctuation) {
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return greeting + ' ' + this.user + punctuation;
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}
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};
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const freddyBound = bindKey(freddy, 'greet');
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console.log(freddyBound('hi', '!')); // 'hi fred!'
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```
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