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- let str = 'aAaA';
- const makeLowerCase = (string) => {
- for ( var i = 0; i < string.length; i++ ) {
- let lower = string[i].toLowerCase();
- if (string[i] !== lower ) {
- string[i] = lower;
- }
- }
- }
- console.log('before', str);
- makeLowerCase(str);
- console.log('after', str);
- before aAaA
- after aAaA
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