There are different methods and techniques you can use to remove elements from JavaScript arrays:

pop – Removes from the End of an Array

var ar = [1, 2, 3, 4, 5, 6];
ar.pop(); // returns 6
console.log( ar ); // [1, 2, 3, 4, 5]

shift – Removes from the beginning of an Array

var ar = ['zero', 'one', 'two', 'three'];
ar.shift(); // returns "zero"
console.log( ar ); // ["one", "two", "three"]

splice – removes from a specific Array index

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
var removed = arr.splice(2,2);

/*
removed === [3, 4]
arr === [1, 2, 5, 6, 7, 8, 9, 0]
*/

filter – allows you to programatically remove elements from an Array

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

for( var i = 0; i < arr.length; i++){ 
   if ( arr[i] === 5) {
     arr.splice(i, 1); 
   }
}