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Add prefix parameter. #13

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Add prefix parameter. #13

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9 changes: 9 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,15 @@ Input: `{key1: val1, key2: val2}`

Output: `{key1: key1, key2: key2}`

You can specify the prefix for all values:

```javascript
keyMirror({
OPEN: null,
CLOSE: null
}, 'WINDOW_');
```

I sometimes use this with lodash - use the following upon your first use of lodash to mix it in:

```javascript
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5 changes: 3 additions & 2 deletions index.js
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Expand Up @@ -35,15 +35,16 @@
* @param {object} obj
* @return {object}
*/
var keyMirror = function(obj) {
var keyMirror = function(obj, prefix) {
prefix = prefix || '';
var ret = {};
var key;
if (!(obj instanceof Object && !Array.isArray(obj))) {
throw new Error('keyMirror(...): Argument must be an object.');
}
for (key in obj) {
if (obj.hasOwnProperty(key)) {
ret[key] = key;
ret[key] = prefix + key;
}
}
return ret;
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