Function append

Appends a value to the end of a string or array.

Example

append('c')('ab'); // -> 'abc'
append(2)('ab'); // -> 'ab2'
append('c')(['a', 'b']); // -> ['a', 'b', 'c']
append(2)(['a', 'b']); // -> ['a', 'b', 2]
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