我嘗試使用 fisher-yates shuffle 字符串，但沒有奏效

Question

我嘗試使用fisher-yates shuffle 對字符串進行改組，但是盡管它正確獲取了索引和值，但它不會對字符串進行改組，有什么問題嗎？

 globalVar = 'I am GLOBAL' function scrambler(anyString) { let placeHolder = anyString for (let i = placeHolder.length - 1; i >= 0; i--) { let swapIndex = Math.floor(Math.random() * (i + 1)) let chartoSwap = placeHolder[swapIndex] let currentChar = placeHolder[i] placeHolder[i] = chartoSwap placeHolder[swapIndex] = currentChar } return placeHolder } let scrambled = scrambler(globalVar) console.log(scrambled)

Answer 1

字符串是不可變的。 placeHolder更改為數組

 globalVar = 'I am GLOBAL' function scrambler(anyString) { let placeHolder = anyString.split("") for (let i = placeHolder.length - 1; i >= 0; i--) { let swapIndex = Math.floor(Math.random() * (i + 1)) let chartoSwap = placeHolder[swapIndex] let currentChar = placeHolder[i] placeHolder[i] = chartoSwap placeHolder[swapIndex] = currentChar } return placeHolder.join("") } let scrambled = scrambler(globalVar) console.log(scrambled)

Answer 2

字符串是不可變的，你不能改變它們。 閱讀本文以獲取更多信息： https://stackoverflow.com/a/1431113/1128441

String.prototype.replaceAt=function(index, replacement) {
  return this.substr(0, index) + replacement+ this.substr(index + replacement.length);
}