Adding an object to an array of objects with splice

Question

I have an array of objects that looks like this:

event_id=[{"0":"e1"},{"0","e2"},{"0","e4"}];

How do I add an element to that array?

I thought of

event_id.splice(1,0,{"0":"e5"});

Thanks.

Answer 1

If you just want to add a value to the end of an array then the push(newObj) function is easiest, although splice(...) will also work (just a bit trickier).

var event_id = [{"0":"e1"}, {"0":"e2"}, {"0":"e4"}];
event_id.push({"0":"e5"});
//event_id.splice(event_id.length, 0, {"0":"e5"}); // Same as above.
//event_id[event_id.length] = {"0":"e5"}; // Also the same.
event_id; // => [{"0":"e1"}, {"0":"e2"}, {"0":"e4"}, {"0":"e5"}]; 

See the excellent MDN documentation for the Array object for a good reference of the methods and properties available on arrays.

[Edit] To insert something into the middle of the array then you'll definitely want to use the splice(index, numToDelete, el1, el2, ..., eln) method which handles both deleting and inserting arbitrary elements at any position:

var a  = ['a', 'b', 'e'];
a.splice( 2,   // At index 2 (where the 'e' is),
          0,   // delete zero elements,
         'c',  // and insert the element 'c',
         'd'); // and the element 'd'.
a; // => ['a', 'b', 'c', 'd', 'e']