替换字符串数组中的最后一个字母 Javascript

Question

我需要做的是：

我有一个包含姓氏的字符串数组。其中一些以字母 'i'.

结尾

manLastNames = ["testowski","bucz","idzikowski","gosz"];

我需要创建一个函数来遍历这个字符串数组，如果有一个以 'i' 结尾的元素，我需要将这个 'i' 替换为 'a'，否则就让字符串保持原样。

最后我想要另一个数组，其中所有最后的 'i's 都替换为 'a's。

女性姓氏 = ["testowska","bucz","idzikowska","gosz"];

这就是我现在拥有的，但我很确定它在某个时候开始变得糟糕

    var rep = function() {
  var manLastNames = ["testowski","bucz","idzkowski","gosz"];
  var womanLastNames = new Array(4);


  for (var i=0; i<manLastNames.length; i++) {
    var lastName = manLastNames[i];
    if (lastName.substr(lastName.length - 1, 1) == 'i') {
        lastName = lastName.substr(0, lastName.length - 1) + 'a';
  }
  }

  for (var i=0; i<womanLastNames.length; i++) {
    womanLastNames[i] = lastName[i];

  }

  console.log(womanLastNames);
}
rep();

Answer 1

试试代码：

var manNames =  ["testowski","bucz","idzkowski","gosz"];
var womanNames = manNames.map(function(name) { 
    return name.endsWith("i") ? name.slice(0, -1) + "a" : name; 
});
console.log(womanNames)

如果你的解释器支持 ES6，下面是等价的：

names.map((name)=>name.endsWith("i") ? name.slice(0, -1) + "a" : name)

Answer 2

这是解决方案

var rep = function() {
  var manLastNames = ["testowski","bucz","idzkowski","gosz"];
  var womanLastNames =[];

  for (var i=0; i<manLastNames.length; i++) {
    var lastName = manLastNames[i];
    if (lastName.charAt(lastName.length - 1) == 'i') {
        lastName = lastName.substr(0, lastName.length - 1) + 'a';
   }
   womanLastNames.push(lastName);
  }
  console.log(womanLastNames);
}
rep();

另一个解决方案是使用像这样的.map方法，使用回调函数：

var manLastNames = ["testowski","bucz","idzikowski","gosz"];
function mapNames(item){
   return item[item.length-1]=='i' ? item.substr(0, item.length-1) + "a" : item;
}
console.log(manLastNames.map(mapNames));

Answer 3

这应该有效：

    var rep = function() {
  var manLastNames = ["testowski","bucz","idzkowski","gosz"];
  var womanLastNames = manLastNames;
  for(var i=0; i<manLastNames.length;i++){
    if(manLastNames[i].charAt(manLastNames[i].length-1)=='i'){
      womanLastNames[i]=manLastNames[i].substr(0,womanLastNames[i].length-1)+'a';
    }
  }
  console.log(womanLastNames);
}
rep();

Answer 4

根据您需要的效率，您可以使用正则表达式来完成这两项任务：

var new_name = name.replace(/i$/, 'a');

将用 "a" 替换字符串中的最后一个 "i"（如果存在）

var new_name = name.replace(/i/g, 'a');

会将字符串中的所有 "i" 替换为 "a"。

var names = ["testowski", "bucz", "idzkowski", "gosz"];
console.log("original", names);

var last_i_replaced = names.map(function(name) {
  return name.replace(/i$/, 'a');
});
console.log("last 'i' replaced", last_i_replaced);

var all_i_replaced = names.map(function(name) {
  return name.replace(/i/g, 'a');
});
console.log("all 'i's replaced", all_i_replaced);

Answer 5

这是另一个解决方案

var manLastNames = ["testowski","bucz","idzkowski","gosz"];
var womanLastNames = []
manLastNames.forEach(x => {
  if (x.charAt(x.length-1) === "i") womanLastNames.push(x.slice(0,-1).concat("a"));
  else womanLastNames.push(x);
});

console.log(womanLastNames);

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