Unable to replace key for an array of objects in Javascript

Question

I have an array of objects and I need to rename the keys.

This is my approach:

Convert array of objects to JSON, replace the key and then do a JSON.parse

Replacing the oldKey with newKey is failing as this is a array!

Here is my JSON string.

str "[{\"194240_0900217\":\"500\"},{\"194242_0900294\":\"600\"}]"

I need like this:

str "[{\"194240\":\"500\"},{\"194242\":\"600\"}]"

Is there any other better approach to achieve this?

Possible duplicate of [JavaScript: Object Rename Key](http://stackoverflow.com/questions/4647817/javascript-object-rename-key) — litel, Apr 18 '16 at 20:32

score 1 · Accepted Answer · answered Apr 18 '16 at 20:42

1

This is the Regex

  var str="[{\"194240_0900217\":\"500\"},{\"194242_0900294\":\"600\"}]"
  var a=str.replace(/(_\d+)/g,"")
  console.log(a); 
// [{"194240":"500"},{"194242":"600"}]

a jsfiddle

answered Apr 18 '16 at 20:42

Yehia Awad

2,898
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score 0 · Answer 2 · edited May 23 '17 at 12:24

Use a for in loop and use either delete after adding a replacement property or just set the old property to undefined depending on your preference after reading How do I remove a property from a JavaScript object?

var data = {
    "194240_0900217": "500",
    "194242_0900294": "600"
};

var k,
    matches;

console.log(data);

for (k in data) {
    if (data.hasOwnProperty(k)) {
        matches = k.match(/(\d+)_\d+/);
        if (matches) {
            data[matches[1]] = data[k];
            delete data[k];
        }
    }
}

console.log(data);

This prints:

{ '194240_0900217': '500', '194242_0900294': '600' }
{ '194240': '500', '194242': '600' }

Unable to replace key for an array of objects in Javascript

2 Answers2