Change key name in JavaScript object

Question

I am checking the attributes in a JavaScript object, replacing some of the keys by deleting the prefix \"element\" and saving the new values in another object.

Answer 1

Try this:

var keys = Object.keys(json);
for (var j=0; j < keys.length; j++) {
   var key = keys[j]; // key
   var value = json[key]; // data
   delete json[key]; // deleting data with old key
   key = key.replace("element_", ""); // renaming key
   json[key] = value; // setting data with new key
}

or extend prototype of Object

Object.prototype.renameKey = function (oldName, newName) {
    if (!newName) return this;
    if (oldName === newName) return this;

    if (this.hasOwnProperty(oldName)) {
        this[newName] = this[oldName];
        delete this[oldName];
    }
    return this;
};

var keys = Object.keys(json);
keys.forEach(function(key) { json.renameKey(key, key.replace('element_', ''); });