How can I get a character array from a string?

by

Note: This is not unicode compliant. "I💖U".split('') results in the
4 character array ["I", "�", "�", "u"] which can lead to dangerous
bugs. See answers below for safe alternatives.

Just split it by an empty string. 

var output = "Hello world!".split('');
console.log(output);

See the String.prototype.split() MDN docs.

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