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javascript/snippets/listify.md

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+---
+title: Map an object to an array
+type: snippet
+tags: [object,array]
+author: chalarangelo
+cover: metro-arrival
+dateModified: 2023-02-05T05:00:00-04:00
+---
+
+Maps an object to an object array, using the provided mapping function.
+
+- Use `Object.entries()` to get an array of the object's key-value pairs.
+- Use `Array.prototype.reduce()` to map the array to an object.
+- Use `mapFn` to map the keys and values of the object and `Array.prototype.push()` to add the mapped values to the array.
+
+```js
+const listify = (obj, mapFn) =>
+  Object.entries(obj).reduce((acc, [key, value]) => {
+    acc.push(mapFn(key, value));
+    return acc;
+  }, []);
+```
+
+```js
+const people = { John: { age: 42 }, Adam: { age: 39 } };
+listify(people, (key, value) => ({ name: key, ...value }));
+// [ { name: 'John', age: 42 }, { name: 'Adam', age: 39 } ]
+```