JavaScript Array splice vs slice

Question

What is the difference between splice and slice?

$scope.participantForms.splice(index, 1);
$scope.participantForms.slice(index, 1);         


        

Answer 1

slice does not change original array it return new array but splice changes the original array.

example: var arr = [1,2,3,4,5,6,7,8];
         arr.slice(1,3); // output [2,3] and original array remain same.
         arr.splice(1,3); // output [2,3,4] and original array changed to [1,5,6,7,8].

splice method second argument is different from slice method. second argument in splice represent count of elements to remove and in slice it represent end index.

arr.splice(-3,-1); // output [] second argument value should be greater then 
0.
arr.splice(-3,-1); // output [6,7] index in minus represent start from last.

-1 represent last element so it start from -3 to -1. Above are major difference between splice and slice method.