To Lower Case | LeetCode 709 (Three Methods)

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Great resource I use to learn algorithms.
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Here is the full implementation.

Method 1

let toLowerCase = function(str) {
    return str.toLowerCase();
};

Method 2

let toLowerCase = function(str) {
    let result = '';
    
    for (let char of str) {
        result += char.toLowerCase();
    }
    
    return result;
};

Method 3

let toLowerCase = function(str) {
    let res = '';
    
    str.split('').forEach( (s, index) => {
       let code = str.charCodeAt(index);
        
        if (code >= 65 && code < 91 ) {
            code += 32;
        }
        
        res += String.fromCharCode(code);
    });
    
    return res;
};