array remove first duplicated element code example

Example 1: javascript remove first element from array

var arr = [1, 2, 3, 4]; 
var theRemovedElement = arr.shift(); // theRemovedElement == 1
console.log(arr); // [2, 3, 4]

Example 2: js remove first and last element from array

a = [1,2,3,4]
b = a.slice(1,-1);