javascript - How can I change the position of a particular item in an array? -

i'm trying change item's index position in array, cannot figure out way.

{    "items": [         1,         3,         2    ]   } 

you can use splice move element in array:

var arr = [         1,         3,         2    ]; var oldindex = 2,     newindex = 1;   arr.splice(newindex, 0, arr.splice(oldindex, 1)[0]); 

this makes [1, 2, 3]

the internal splice removes , returns element, while external 1 inserts back.

---

just fun defined generic function able move slice, not element, , doing computation of index:

object.defineproperty(array.prototype, "move", {     value:function(oldindex, newindex, nbelements){         this.splice.apply(             this, [newindex-nbelements*(newindex>oldindex), 0].concat(this.splice(oldindex, nbelements))         );     } });  var arr = [0, 1, 2, 7, 8, 3, 4, 5, 6, 9]; arr.move(5, 3, 4); console.log('1:', arr) // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]   var arr = [0, 1, 2, 7, 8, 3, 4, 5, 6, 9]; arr.move(3, 9, 2); console.log('2:', arr); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]   var arr = [0, 1, 2, 4, 5, 3, 6, 7]; arr.move(5, 3, 1); console.log('3:', arr); // [0, 1, 2, 3, 4, 5, 6, 7]   var arr = [0, 3, 1, 2, 4, 5, 6, 7]; arr.move(1, 4, 1); console.log('3:', arr); // [0, 1, 2, 3, 4, 5, 6, 7]  

js bin