Javascript array element indexOf is -1 after swap of element positions with splice -

our array has 2 elements of type object this:

array = [{member1: "value1"},{member2: "value2"}]; 

when index of second object this:

var index = array.indexof(obj); 

i 1 result, fine. when swap 2 elements shift object right left , other 0 index object left right:

var new_index = index - 1; array.splice(index, 0, array.splice(new_index, 1)[0]); 

and try index of same object (which know present in array , index 0 now) -1 (not found) result. whats problem here?

as want swap, rather splicing may better use temporary variable.

var array = [{member1: "value1"},{member2: "value2"}],     obj = array[1];  function swap(arr, i, j) {     var t = arr[i];     arr[i] = arr[j];     arr[j] = t;     return arr; }  console.log('before swap', array.indexof(obj)); // 1  swap(array, 0, 1); console.log('after swap', array.indexof(obj)); // 0 

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edit tried code though , expected result of 0, maybe you've done reference obj pointing @ between two