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snippets/js/s/flags.md

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+---
+title: Array to flags object
+type: snippet
+language: javascript
+tags: [array,object]
+author: chalarangelo
+cover: glass-blowing
+dateModified: 2022-04-12T05:00:00-04:00
+---
+
+Converts an array of strings into an object mapping to true.
+
+- Use `Array.prototype.reduce()` to convert the array into an object, where each array value is used as a key whose value is set to `true`.
+
+```js
+const flags = arr => arr.reduce((acc, str) => ({...acc, [str]: true }), {});
+```
+
+```js
+flags(['red', 'green']); // { red: true, green: true }
+```