Similarity between arrays, object from key-value pairs

snippets/object-from-key-value-pairs.md

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+### Object from key-value pairs
+
+Use `map()` to create objects for each key-value pair, combine with `Object.assign()`.
+
+```js
+var objectFromPairs = arr =>
+  Object.assign(...arr.map( v => {return {[v[0]] : v[1]};} ));
+```