issue to delete an array item form json object

Question

I have the following code for moving one array item to another.

var data={"Used":[{"Items":[{"ID":1,"Name":"item1"},{"ID":2,"Name":"item1"}]}],"UnUsed":[{"Items":[]}]};    
data.UnUsed[0].Items.splice(0,0,data.Used[0].Items);    
var len=data.Used[0].Items.length;  
for(i=0;i<len;i++)  
{
    data.Used[0].Items.splice(0,1);
}   
console.log(JSON.stringify(data));

Current Output is:

{"Used":[{"Items":[]}],"UnUsed":[{"Items":[[]]}]}

Expected Output is:

{"Used":[{"Items":[]}],"UnUsed":[{"Items":[[{"ID":1,"Name":"item1"},{"ID":2,"Name":"item1"}]]}]}

Then maybe like: data.UnUsed[0].items = data.Used[0].items.slice(0); data.Used[0].items = []; — phylax
– phylax, Commented May 2, 2014 at 15:36
if i use above code, i am getting this error 'Uncaught TypeError: Cannot call method 'slice' of undefined '. — CHANDRA
– CHANDRA, Commented May 2, 2014 at 15:44
You don't need to use slice/splice. Take a look at my answer and demo. — Andy
– Andy, Commented May 2, 2014 at 15:48

James Duffy · Accepted Answer · 2014-05-02 15:46:41Z

1

Here's one solution: http://jsfiddle.net/K3cz3/

var data={"Used":[{"Items":[{"ID":1,"Name":"item1"},{"ID":2,"Name":"item1"}]}],"UnUsed":[{"Items":[]}]};    
var len = data.Used[0].Items.length;
for (i = 0; i < len; i++) {
    data.UnUsed[0].Items.splice(0, 0, data.Used[0].Items[0]);
    data.Used[0].Items.splice(0, 1);
}
console.log(JSON.stringify(data));

Edit:

Here's a better one that makes it more clear what's happening:

var len = data.Used[0].Items.length;
for (i = 0; i < len; i++) {
    data.UnUsed[0].Items.push(data.Used[0].Items.pop());
}
console.log(JSON.stringify(data));

Fiddle: http://jsfiddle.net/K3cz3/1/

Or simply:

data.UnUsed[0].Items = data.Used[0].Items;
data.Used[0].Items = [];
console.log(JSON.stringify(data));

Fiddle: http://jsfiddle.net/K3cz3/2/

edited May 2, 2014 at 15:46

answered May 2, 2014 at 15:36

James Duffy

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Andy · Accepted Answer · 2014-05-02 15:47:24Z

1

You could do it this way - saves having to splice all over the shop.

data.UnUsed[0].Items = data.Used[0].Items;
data.Used[0].Items = [];

Demo

edited May 2, 2014 at 15:47

answered May 2, 2014 at 15:41

Andy

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