Some js array utility methods

jsArrayMethods.md

The shift() method removes the first element from an array and returns that element. This method changes the length of the array.

var a = [1, 2, 3];
a.shift();

console.log(a); // [2, 3]

The slice() method returns a shallow copy of a portion of an array into a new array object selected from begin to end (end not included). The original array will not be modified.

var a = ["zero", "one", "two", "three"];
var sliced = a.slice(1,3);

console.log(a);      // [ "zero", "one", "two", "three" ]
console.log(sliced); // [ "one", "two" ]

The splice() method changes the content of an array by removing existing elements and/or adding new elements.

var myFish = ["angel", "clown", "mandarin", "surgeon"];
myFish.splice(2, 0, "drum"); 

// myFish is ["angel", "clown", "drum", "mandarin", "surgeon"]