JSFiddle - React, Tailwind, and code Playground

by Jessie Lau

JavaScript

var lengthOfSequence = function (arr, n) {
    // TODO: Write some scripts here
    var firstIndex = arr.indexOf(n);
    var lastIndex = arr.lastIndexOf(n);
    var counter = 0;
    for (var i = firstIndex+1; i <= lastIndex-1; i++) {
        counter++;
		if(arr[i] == n || lastIndex == 0){
        	return 0;
        }
    }
    return counter+2;
}
//console.log(lengthOfSequence([-7, 6, 2, -7, 4], -7));
//console.log(lengthOfSequence([-7, 5, 0, 2, 9, 5], 5));
console.log(lengthOfSequence([1, 2, 3], 1));