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javascript/snippets/call.md

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+---
+title: Call functions with context
+type: snippet
+tags: [function]
+cover: rabbit-call
+dateModified: 2021-06-13T13:50:25+03:00
+---
+
+Given a key and a set of arguments, call them when given a context.
+
+- Use a closure to call `key` with `args` for the given `context`.
+
+```js
+const call = (key, ...args) => context => context[key](...args);
+```
+
+```js
+Promise.resolve([1, 2, 3])
+  .then(call('map', x => 2 * x))
+  .then(console.log); // [ 2, 4, 6 ]
+const map = call.bind(null, 'map');
+Promise.resolve([1, 2, 3])
+  .then(map(x => 2 * x))
+  .then(console.log); // [ 2, 4, 6 ]
+```