String case conversion javascript

Question

So I really need help with something thats been bugging me for some time now. I have a function which looks like this:

var convertString = function (str){

// Place for additional code here.

return str;};

And what I need this function to do is to convert the string that comes with str.

Example: I need the scentence "I really LOVE JavaScript" to be converted to "i RE#LLY love j#V#sCRIPT"

I have no idea whatsoever how to accomplish this, please help!

So you want to invert the case and change `A` into `#`? One word: ***why***? — lonesomeday, Nov 16 '13 at 13:15
@lonesomeday Precisely. It's a small part of an assignment I'm working on. — Lemonmuncher, Nov 16 '13 at 13:16
@BendErR Well, I'm really new to JavaScript so I don't know much about it. I've tried to make an array of the string with a for-loop, so that I can check each character, but I have no idea how to write the code for the check and conversion. — Lemonmuncher, Nov 16 '13 at 13:18

adeneo · Accepted Answer · 2013-11-16T13:28:45.800

1

var convertString = function (str){
    var s = '';
    for (var i=0; i<str.length; i++) {
        var n = str.charAt(i);
        s +=  (n.toLowerCase()=='a' ? '#' : n == n.toUpperCase() ? n.toLowerCase() : n.toUpperCase());
    }
    return s;
}

FIDDLE

edited Nov 16 '13 at 13:28

answered Nov 16 '13 at 13:17

adeneo

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This actually works splendid, although I do need to convert all "A"s into "#" aswell, and it seems to skip that part. – Lemonmuncher Nov 16 '13 at 13:26
@Lemonmuncher - wasn't sure about that one, but I've edited the answer to convert both cases to # – adeneo Nov 16 '13 at 13:28
I fixed it by adding ||n == 'A' after n=='a'. Now it works properly! Thanks! – Lemonmuncher Nov 16 '13 at 13:29

score 1 · Answer 2 · answered Nov 16 '13 at 13:23

1

Another solution using split and map

var convertString = function (str) {
    return str.split("").map(function(x){
        return x!='a' ? 
            x == x.toUpperCase() ? x.toLowerCase() : x.toUpperCase() 
            : "#"
    }).join("");
}

answered Nov 16 '13 at 13:23

UltraInstinct

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Not sure if I follow 'a', but I love the logic. super simple – Winnemucca Jun 24 '16 at 20:38

score 0 · Answer 3 · answered Nov 16 '13 at 13:17

You may try this:-

function my()
{

x= "I really LOVE JavaScript";
str="";
for (i=0; i<x.length; i++) 
{
 currStr=x.charAt(i)
 mystr=(currStr=='a' ? '#' : currStr==currStr.toUpperCase())?currStr.toLowerCase():currStr.toUpperCase();
 str=str+""+mystr 
 }
alert("final=="+str)
 }

And if thats a typo that you dont want to convert 'a' to '#' rather 'A' then just remove currStr=='a' ? '#' : part from above code.

String case conversion javascript

3 Answers3