Welcome to our programming practice lesson! Are you ready for a challenging yet exciting task involving nested loops and arrays? We will be unraveling the skill of using nested loops to search through two arrays. Brace yourself for a remarkable journey of practical learning. Let's get started!

Imagine a scenario where you are given two arrays of integers. Your task is to write a function that retrieves and returns pairs of integers. The first item of the pair will be from the first array, while the second one will come from the second array. It's crucial to remember that the first element must be less than the second.

The sequence of pairs in your output should align with the order they appear in the input arrays. For instance, given the arrays [1, 3, 7] and [2, 8, 9], the function should return ["1 2", "1 8", "1 9", "3 8", "3 9", "7 8", "7 9"]. It will pose a challenge if no pairs exist or if any input array is empty. Let's delve into this task step by step to uncover the solution!

Before venturing into the code, let's decode the problem. Nested looping fits perfectly here.

Start by creating an empty array named result to store our pairs.

function retrievePairs(array1, array2) {
    let result = [];

Creating your function and data structure first is a wise strategy!

Now, the focus turns to forming the nested loops. You need to iterate over both arrays, and for this, you'll need nested loops. An outer loop will select one element from the first array, and an inner loop will scan through each element of the second array.

function retrievePairs(array1, array2) {
    let result = [];
    for (let i of array1) {
        for (let j of array2) {
            // Our logic goes here
        }
    }
    return result;
}

In this setup, every element in array1 is represented by i, and for each i, j represents an element in array2.