js remove several elements from array

1var ar = ['zero', 'one', 'two', 'three'];ar.shift(); // returns "zero"console.log( ar ); // ["one", "two", "three"]

1var array = [1, 2, 3, 4];var evens = _.remove(array, function(n) { return n % 2 === 0;});console.log(array);// => [1, 3]console.log(evens);// => [2, 4]

1var ar = [1, 2, 3, 4, 5, 6];ar.length = 4; // set length to remove elementsconsole.log( ar ); // [1, 2, 3, 4]

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

1var arr1 = [1, 2, 3, 4, 5, 6];var arr2 = arr1; // Reference arr1 by another variable arr1 = [];console.log(arr2); // Output [1, 2, 3, 4, 5, 6]