Question

我在javascript中有一个字符串，其中有很多重复项。例如，我有：

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"

如何删除重复项并获取x="Int32,Double"？

Answer 1

使用Set和Array.from这非常简单：

Array.from(new Set(x.split(','))).toString()

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"
x = Array.from(new Set(x.split(','))).toString();
document.write(x);

Answer 2

如果您必须支持当前的浏览器，则可以拆分数组然后对其进行过滤

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
    
var arr = x.split(',');
    
x = arr.filter(function(value, index, self) { 
    return self.indexOf(value) === index;
}).join(',');

document.body.innerHTML = x;

Answer 3

这是一种更具可读性和参数化的解决方案：

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"
var removeDup = [...new Set(x.split(","))].join(",");

//结果为“ Int32，Double”

Answer 4

签出-

removeDuplicates （）函数将字符串作为参数，然后字符串拆分函数是一个内置函数，将其拆分为单个个字符的数组。然后 arr2 数组开始时为空，一个 forEach 循环检查 arr2 中的每个元素-如果 arr2 具有元素，它将不会在其中推送字符，否则它将推送。因此，最终返回的数组包含唯一元素。。最后，我们使用 join（）方法将数组连接起来，使其成为 string 。

const removeDuplicates = (str) => {
const arr = str.split("");
const arr2 = [];

arr.forEach((el, i) => {
 if (!arr2.includes(el)) {
    arr2.push(el);
   }
 });
 return arr2.join("").replace(",", "").replace("", " ");
};

console.log(removeDuplicates( "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"));

Answer 5

它很简单，只需使用 new Set 和 join 删除字符串中的重复项。

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
console.log([...new Set(x)].join(""));

Answer 6

function removeDuplicate(x)
{
    var a = x.split(',');
    var x2 = [];
    for (var i in a)
        if(x2.indexOf(a[i]) == -1) x2.push(a[i])
    return  x2.join(',');
}

Answer 7

function removeDups(s) {
let charArray = s.split("");
  for (let i = 0; i < charArray.length; i++) {
    for (let j = i + 1; j < charArray.length; j++)
      if (charArray[i] == charArray[j]) {
        charArray.splice(j, 1);
        j--;
      }
  }
  return charArray.join("");
}
console.log(removeDups("Int32,Int32,Int32,InInt32,Int32,Double,Double,Double"));

Answer 8

使用新的js语法从字符串中删除Dupicate。

String.prototype.removeDuplicate = Function() {
  const set = new Set(this.split(','))
  return [...set].join(',')
}
x.removeDuplicate()

Answer 9

  function myFunction(str) {
    var result = "";
    var freq = {};
    for(i=0;i<str.length;i++){
       let char = str[i];
       if(freq[char]) {
        freq[char]++;      
       } else {
        freq[char] =1
        result = result+char;
       }
    }
    return result;
  }

Answer 10

const str =  "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
const usingSpread = [...str]
const duplicatesRemove = [...new Set(usingSpread)]
const string = duplicatesRemove.join("")
console.log("After removing  duplicates: " + string)

步骤

使用扩展运算符将字符串转换为字符数组
new Set 将隐式删除重复字符
使用 join("") 方法将字符数组转换为字符串

删除字符串中的重复项 - javascript

10 个答案: