Edit in JSFiddle

/* Remove 1 element from index 3 */
console.error("====== Remove 1 element from index 3 =====");
var myFish = ['angel', 'clown', 'drum', 'mandarin', 'sturgeon'];
var removed = myFish.splice(3, 1);
console.log("myFish is ", myFish); // removed is ["mandarin"]
console.log("removed is ", removed); // myFish is ["angel", "clown", "drum", "sturgeon"] 


/* Remove 2 elements from index 2 */
console.error("##### Remove 2 elements from index 2 #####");
var myFish = ['parrot', 'anemone', 'blue', 'trumpet', 'sturgeon'];
var removed = myFish.splice(2, 2);
console.log("myFish is ", myFish); // myFish is ["parrot", "anemone", "sturgeon"] 
console.log("removed is ", removed); // removed is ["blue", "trumpet"]


/* Remove all elements after index 2  */
console.error("***** Remove all elements after index 2 *****");
var myFish = ['angel', 'clown', 'mandarin', 'sturgeon'];
var removed = myFish.splice(2);
console.log("myFish is ", myFish); // myFish is ["angel", "clown"]
console.log("removed is ", removed); // removed is ["mandarin", "sturgeon"]