Create size.md

snippets/size.md

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+### size
+
+Get size of arrays, objects or strings.
+
+Get type of value – array, object and string. Use `length` property for arrays. Return `length` or `size` value if available or number of object keys. Split strings into array of characters with `split('')` and return its length.
+
+```js
+const size = value => Array.isArray(value) ? value.length : value && typeof value === 'object' ? value.size || value.length || Object.keys(value).length : typeof value === 'string' ? value.split('').length : 0;
+```
+
+```js
+size([ 1, 2, 3, 4, 5 ]); // 5
+size('size'); // 4
+size({ one: 1, two: 2, three: 3 }); // 3
+```