How to convert split words into lowercase

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How do i convert words i have split into lowercase ? I have the following code.

var title = 'The Quick brown fox';

var titleCase = [];


var Titlewords = title.split("");

for (var i = 0; i < Titlewords.length; i++) 
 Titlewords[i].toLowerCase();

 console.log(Titlewords[i]);

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لینک منبع