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snippets/js/s/bind.md

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+---
+title: Bind function context
+type: snippet
+language: javascript
+tags: [function,object]
+cover: tranquility
+dateModified: 2020-10-18T23:04:45+03:00
+---
+
+Creates a function that invokes `fn` with a given context, optionally prepending any additional supplied parameters to the arguments.
+
+- Return a `function` that uses `Function.prototype.apply()` to apply the given `context` to `fn`.
+- Use the spread operator (`...`) to prepend any additional supplied parameters to the arguments.
+
+```js
+const bind = (fn, context, ...boundArgs) => (...args) =>
+  fn.apply(context, [...boundArgs, ...args]);
+```
+
+```js
+function greet(greeting, punctuation) {
+  return greeting + ' ' + this.user + punctuation;
+}
+const freddy = { user: 'fred' };
+const freddyBound = bind(greet, freddy);
+console.log(freddyBound('hi', '!')); // 'hi fred!'
+```