RPGDATA = {
turkey: 'Leg',
chicken: 'Muffin'
}
var tempdata = RPGDATA;
RPGDATA.turkey = 'NoLeg';
console.log(tempdata); // I'm seeing 'NoLeg' here, but shouldn't it be 'Leg'?
console.log(RPGDATA);
Check out this code on jsfiddle: http://jsfiddle.net/njxd7eLy/1/
Why is tempdata showing the updated object instead of the original data?
Update: Here's an example for clarification: http://jsfiddle.net/zLeufxfm/ The old data is stored in tempdata, but not as a separate object.
In JavaScript, objects are passed by reference, so if you want to modify each object independently, you must clone the object.
One way to accomplish this is by using the JSON object.
Click here to view an example.
var myObj = {
name: 'bob',
age: '42'
};
var copy = JSON.parse(JSON.stringify(myObj));
myObj.newProp = 'Hello';
copy.otherProp = 'Yo';
console.log(copy, myObj);
For further reading:
The result will show "NoLeg" as per Oka's explanation that objects in JavaScript are passed by reference.
The provided diagram is simple to comprehend and aids in grasping how values are transmitted in JavaScript:
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