How do I split a string into an array of characters? [duplicate]

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You can split on an empty string:

var chars = "overpopulation".split('');

If you just want to access a string in an array-like fashion, you can do that without split:

var s = "overpopulation";
for (var i = 0; i < s.length; i++) {
    console.log(s.charAt(i));
}

You can also access each character with its index using normal array syntax. Note, however, that strings are immutable, which means you can’t set the value of a character using this method, and that it isn’t supported by IE7 (if that still matters to you).

var s = "overpopulation";

console.log(s[3]); // logs 'r'

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