709. To Lower Case

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

• Example 1:
  Input: "Hello"
  Output: "hello"

• Example 2:
  Input: "here"
  Output: "here"

• Example 3:
  Input: "LOVELY"
  Output: "lovely"

//處理一
var toLowerCase = (str) => str.toLowerCase()

//處理二
var toLowerCase = function(str) {
    let result = '';
    let charCode;
    str.split('').forEach(i => {
        charCode = i.charCodeAt(0);
        if(charCode >= 65 && charCode <= 90) charCode += 32;
        
        result += String.fromCharCode(charCode)
    })
    return result;
}

Note

• charCodeAt 取得字元對應的ASCII碼
  let ascii = 'a'.charCodeAt(0); // 97
• fromCharCode 取得ASCII碼所對應的字元
  let char = String.fromCharCode(ascii); // 'a'