findModeNumbersRange()

Step 1: Start with an empty code block

First, we need to create a function called findModeNumbersRange. Next, create an empty array within the function to hold our range of numbers.

function findModeNumbersRange() {
    let numberArray = [];
}

Step 2: Populate the array with the range

Now we should fill the number array with a range of numbers; for the purpose of this example, let's use 1 to 100. Use the for loop to iterate from 1 to 100 and push each number into the array.

function findModeNumbersRange() {
    let numberArray = [];
    for(let i = 1; i <= 100; i++) {
        numberArray.push(i);
    }
}

Step 3: Find the mode

To find the mode (the number that occurs most often) in the range, we will return to our for loop and create a map to store the frequentcy of each array entry.

function findModeNumbersRange() {
    let numberArray = [];
    let frequency = {};
    let max = 0;
    let mode;
    for(let i = 1; i <= 100; i++) {
        numberArray.push(i);
        frequency[numberArray[i]] = (frequency[numberArray[i]] || 0) + 1;
        if(frequency[numberArray[i]] > max) {
            max = frequency[numberArray[i]];
            mode = numberArray[i];
        }
    }
    return mode;
}

Step 4: Test the function

We can test the function by calling it. Since we used the numbers from 1 to 100, and each number has exactly the same frequency, all numbers are modes.

console.log(findModeNumbersRange()); // 100

Conclusion

In this post, we learned how to find the mode in a range of numbers using JavaScript. This function can easily be adjusted to find the mode for any range of numbers, simply replace the limits in the for loop with the desired range.