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up vote 1 down vote favorite

I was wondering if anyone could help me with a simple solution to convert each integer in a javascript string to its corresponding key in a key:value pair array. For example if I have:

var arr = {'3':'value_three', '6':'value_six', '234':'other_value'};
var str = 'I want value 3 here and value 234 here';

I would expext the output to be:

new_str = 'I want value_three here and value other_value here'

Sorry this is my first post so I hope that makes sense, I'm using javascript and jquery (latest version). Any help would be grealy appreciated.

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1 Answer

up vote 2 down vote accepted

I'm just doing this off the top of my head, but this should work.

var new_str = str;

for (var key in arr) {
    if (!arr.hasOwnProperty(key)) {
        continue;
    }

    new_str = new_str.replace(key, arr[key]);
}

If you wanted all occurrences of the number to be replaced, you'd need to incorporate a Regex into the mix:

var new_str = str;

for (var key in arr) {
    if (!arr.hasOwnProperty(key)) {
        continue;
    }

    new_str = new_str.replace(new RegExp(key, "g"), arr[key]);
}

Also, I'd pick another name other than arr, as that implies it's an array when it's clearly an object. Also, make sure you only use for-in loops on objects, not arrays, because of issues with prototype leakage and others.

You can also do this with jQuery, but it's probably overkill:

var new_str = str;

$.each(arr, function (key, value) {
    new_str = new_str.replace(key, value);
});
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Sorry for the usage of the variable names was trying to use a simple example. I continue to get a typeerror though when trying to use the replace method, do I need to type cast the key or something similar? –  Ninja Pants Jun 26 '12 at 1:55
 
Forget that, I worked it out. Thank you very much for your help and prompt response. Quick question, why is the jquery version overkill? –  Ninja Pants Jun 26 '12 at 2:17
 
Because there is nothing in jQuery to help with the solution. –  RobG Jun 26 '12 at 3:12
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