如何替换javascript中字符串的前两个字符？

Question

lets suppose i have string

var string = "$-20455.00"

I am trying to swap first two characters of a string. I was thinking to split it and make an array and then replacing it, but is there any other way? Also, I am not clear how can I achieve it using arrays? if I have to use arrays.

var string = "-$20455.00"

How can I achieve this?

Answer 1

You can use the replace function in Javascript.

var string = "$-20455.00"
string = string.replace(/^.{2}/g, 'rr');

Here is jsfiddle: https://jsfiddle.net/aoytdh7m/33/

Answer 2

You dont have to use arrays. Just do this

string[1] + string[0] + string.slice(2)

Answer 3

You can split to an array, and then reverse the first two characters and join the pieces together again

 var string = "$-20455.00"; var arr = string.split(''); var result = arr.slice(0,2).reverse().concat(arr.slice(2)).join(''); document.body.innerHTML = result; 

Answer 4

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try using the "slice" method and string concatenation:

stringpart1 = '' //fill in whatever you want to replace the first two characters of the first string with here
string2 = stringpart1 + string.slice(1)

edit: I now see what you meant by "swap". I thought you meant "swap in something else". Vlad's answer is best to just switch the first and the second character.

Note that string[0] refers to the first character in the string, and string[1] to the second character, and so on, because code starts counting at 0.

Answer 5

 var string = "$-20455.00"; // Reverse first two characters var reverse = string.slice(0,2).split('').reverse().join(''); // Concat again with renaming string var result= reverse.concat(string.slice(2)); document.body.innerHTML = result; 

Answer 6

let finalStr = string[1] + string[0] + string.slice(2); //this will give you the result