Function firstOrSelf

Returns the first element of an array or the value itself if it's not an array.

firstOrSelf('Hello'); // 'Hello'
firstOrSelf(['Hello', 'World']); // 'Hello'
firstOrSelf([]); // undefined
firstOrSelf(null); // undefined
firstOrSelf(undefined); // undefined
firstOrSelf(0); // 0
firstOrSelf(''); // ''
firstOrSelf(false); // false
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