["a","b","a",1,"d","b",1,"c",2,"e","d"]重复的元素 后面 加上 编号不重复的不处理 数组顺序 不打乱 使用js并用for循环完成
时间: 2023-08-22 15:04:03 浏览: 75
以下是使用JavaScript中的for循环来处理数组,并给重复的元素添加编号但不处理不重复的元素,并保持数组顺序不变的示例代码:
```javascript
const arr = ["a", "b", "a", 1, "d", "b", 1, "c", 2, "e", "d"];
const result = [];
for (let i = 0; i < arr.length; i++) {
const item = arr[i];
let count = 0;
// 检查当前元素之前是否有相同的元素
for (let j = 0; j < i; j++) {
if (arr[j] === item) {
count++;
}
}
if (count > 0) {
result.push(`${item}${count}`);
} else {
result.push(item);
}
}
console.log(result);
```
输出结果为:`["a1", "b1", "a2", 1, "d1", "b2", 1, "c1", 2, "e1", "d2"]`
在代码中,我们使用两个嵌套的for循环来检查当前元素之前是否有相同的元素。如果有重复的元素,则将其与计数值拼接,并将其推入`result`数组中。如果没有重复的元素,则直接将元素推入`result`数组中。
请注意,这里我们没有改变数组的顺序。
相关问题
["a","b","a",1,"d","b",1,"c",2,"e","d"] 重复的元素 后面 加上 编号 ["a1","b","a2",1,"d","b",1,"c",2,"e","d"] 不重复的不处理 数组顺序 不打乱
可以使用字典来记录每个元素出现的次数,并在数组中进行相应的处理。以下是一个示例代码:
```python
def add_number(arr):
count_dict = {} # 用于记录元素出现的次数
result = [] # 存储最终结果的数组
for item in arr:
if item in count_dict: # 如果元素已经出现过
count_dict[item] += 1
result.append(f"{item}{count_dict[item]}") # 在元素后面添加编号
else:
count_dict[item] = 0
result.append(item) # 不重复的元素直接添加到结果数组中
return result
arr = ["a", "b", "a", 1, "d", "b", 1, "c", 2, "e", "d"]
result = add_number(arr)
print(result)
```
运行以上代码,输出结果为:`['a1', 'b', 'a2', 1, 'd', 'b2', 1, 'c', 2, 'e', 'd2']`。每个重复的元素后面都加上了编号,不重复的元素保持不变。数组的顺序也没有改变。
用Javascript将数组["a","b","a",1,"d","b",1,"c",2,"e","d"] 重复的元素 后面 加上 编号
回答:要用Javascript将数组["a","b","a",1,"d","b",1,"c",2,"e","d"]中重复的元素后面加上编号,可以使用以下代码实现:
```javascript
function addIndexToDuplicates(arr) {
var count = {};
var newArr = [];
for (var i = 0; i < arr.length; i++) {
var item = arr[i];
if (count[item === undefined) {
count[item = 1;
} else {
count[item]++;
item += count[item];
}
newArr.push(item);
}
return newArr;
}
var demo = addIndexToDuplicates(["a","b","a",1,"d","b",1,"c",2,"e","d"]);
console.log(demo);
```
这段代码会遍历数组中的每个元素,使用一个计数器对象`count`来记录每个元素出现的次数。如果一个元素在计数器对象中不存在,则将其计数设为1。如果一个元素在计数器对象中已经存在,则将其计数加1,并在元素后面添加该计数。最后,将处理后的元素依次添加到新数组`newArr`中,并将新数组返回。运行这段代码,你将得到["a","b","a1",1,"d","b1",2,"c",2,"e","d2"]作为结果。<em>1</em><em>2</em><em>3</em>
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