Added new directory Hacktoberfest-2021/FirdausRazali/js-exercise and …

…an exercise001.js file in it

Hacktoberfest-2021/FirdausRazali/js-exercise/exercise001.js

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+/*
+Stand in Line
+
+In Computer Science a queue is an abstract Data Structure where items are kept in order.
+New items can be added at the back of the queue and old items are taken off from the front of the queue.
+
+Write a function `nextInLine` which takes an array (`arr`) and a number (`item`) as arguments.
+
+Add the number to the end of the array, then remove the first element of the array.
+
+The `nextInLine` function should then return the element that was removed.
+
+Display the initial array, the return element, and the modified array.
+*/
+
+/*
+pop = remove last element
+push = add last element
+shift = remove first element
+unshift = add first element
+*/
+
+let testArr = [1, 2, 3, 4, 5]; // initialize array
+
+function nextInLine(arr, item){
+    arr.push(item);// add item to end of array
+    return arr.shift();// remove first element from array
+}
+
+console.log("Before: " + JSON.stringify(testArr));
+console.log("Removed element: " + JSON.stringify(nextInLine(testArr, 6)));
+console.log("After: " + JSON.stringify(testArr));
+
+/*
+JSON.stringify== is used to convert array or object (in this case, array testArr) to string for display purpose.
+This can be useful when want to transmit or store data in a text-based format,
+such as when working with APIs or saving data to a file.
+*/