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snippets/js/s/to-pairs.md

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+---
+title: Object to pairs
+type: snippet
+language: javascript
+tags: [object,array]
+author: chalarangelo
+cover: purple-leaves
+dateModified: 2020-10-22T20:24:30+03:00
+---
+
+Creates an array of key-value pair arrays from an object or other iterable.
+
+- Check if `Symbol.iterator` is defined and, if so, use `Array.prototype.entries()` to get an iterator for the given iterable.
+- Use `Array.from()` to convert the result to an array of key-value pair arrays.
+- If `Symbol.iterator` is not defined for `obj`, use `Object.entries()` instead.
+
+```js
+const toPairs = obj =>
+  obj[Symbol.iterator] instanceof Function && obj.entries instanceof Function
+    ? Array.from(obj.entries())
+    : Object.entries(obj);
+```
+
+```js
+toPairs({ a: 1, b: 2 }); // [['a', 1], ['b', 2]]
+toPairs([2, 4, 8]); // [[0, 2], [1, 4], [2, 8]]
+toPairs('shy'); // [['0', 's'], ['1', 'h'], ['2', 'y']]
+toPairs(new Set(['a', 'b', 'c', 'a'])); // [['a', 'a'], ['b', 'b'], ['c', 'c']]
+```