Accessing both JavaScript Object key and value

Question

I'm writing a mapper which spots identifying words in a string and replaces them with another word. In my case a location identifier with the actual directory location.

My Problem is on line 8 : str.replace(x.toString(), keys[x]);

The value x is the value as expected but keys[x] returns undefined.

var keys = {
   "$processes"        : "/processes",
   "$local_resources"  : "/feeds/local"
};

function CoreRoute(str){
   for (var x in keys){
      str.replace(x, keys[x]);
   }
   return str;
}

I am developing in the node enviroenment. But I'm pretty sure it's a mistake with my logic.

Dan List · Accepted Answer · 2011-11-01 10:22:11Z

1

Strings are immutable in Javascript, so String.replace() can't modify str, it returns a new String with the replacement performed. Change

str.replace(x, keys[x]);

to

str = str.replace(x, keys[x]);

End code:

var keys = {
    "$processes"       : "/processes",
    "$local_resources" : "/feeds/local"
};

function CoreRoute(str) {
    for (var x in keys) {
        str = str.replace(x, keys[x]);
    }
    return str;
}

edited Nov 1, 2011 at 10:22

Dan List

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answered Oct 28, 2011 at 8:50

Eugene

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