Let's say I have:
var obj1 = {
'0': 'a',
'1': 'b'
}
var obj2 = obj; // I want to create a new object with obj contents
obj1[2] = 'c' // Now I modify obj without modifying obj2
obj1 = obj2; // so I can restore obj later
However modifying obj also modificates obj2. How can I create a copy of obj1 that is independent of it?
You need to do a deepCopy of the object.
var obj1 = {
'0': 'a',
'1': 'b'
};
var obj2 = deepCopy(obj1);
obj1[2] = 'c'
console.log(obj1);
console.log(obj2);
function deepCopy(obj) {
var newObj = {};
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
newObj[key] = obj[key];
}
}
return newObj;
}
If your object is JSON-compatible (i.e., does not contain any functions as values, nor references to DOM nodes, etc):
var obj2 = JSON.parse(JSON.stringify(obj1));
