Question

151

JavaScript concat string with backspace

rated 0 times [ 156] [ 5] / answers: 1 / hits: 18284 / 12 Years ago, thu, august 9, 2012, 12:00:00

I have a function f similar to

function f(str){

    alert(abc+str);

}

Now, I want to use JavaScript special charecter b in such a way that I can choose if I want to display the hardcoded string abc or not. For example,

f(bb+yz); //should output ayz

I tried the same, but it does not work. In other words, I want to concat a string with a backspace character so that I can remove last characters from the string.

Can we do this in JavaScript?

EDIT
The real code is too much big (its a HUGE 1 liner that concats many many strings). To map that in above example, we cannot edit the function f, so do whatever you want from outside function f.

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talonb

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3 Years ago

answered 12 Years ago malkajillc · Accepted Answer

The problem comes from the fact that b is just another character in the ASCII code. The special behaviour is only when implemented by some string reader, for example, a text terminal.

You will need to implement the backspace behaviour yourself.

function RemoveBackspaces(str)

{

    while (str.indexOf(b) != -1)

    {

        str = str.replace(/.?x08/, ); // 0x08 is the ASCII code for b

    }

    return str;

}

Example: http://jsfiddle.net/kendfrey/sELDv/

Use it like this:

var str = RemoveBackspaces(f(bbyz)); // returns ayz