Javascript从属性中删除对象

Question

If you have an object attached to a property like so :

obj = {};
obj.prop = {name:'test'};

Is there a way, similar to using array.splice , to remove the object from that property, and return it so it can be attached to another object?

Answer 1

Sure you can:

 var obj = {}; obj.prop = { name: 'test' }; var newObj = { prop: obj.prop} ; // Copy prop to a new object delete obj.prop; // delete `prop` on the old object. document.body.textContent = 'newObj: ' + JSON.stringify(newObj);

delete throws an error in strict mode if the property is an own non-configurable property (returns false in non-strict). It returns true in all other cases.

So, while there technically isn't a function like pop or splice that returns the removed property, it's trivial to work around that.

Answer 2

To delete/return a property from an object in one swoop, I think you need your own function for this. Something like:

 function removeValue(obj, property) { var prop = obj[property]; delete obj[property]; return prop; }