Extra Practice

Remember: Learning to program takes practice! It helps to see concepts over and over, and it's always good to try things more than once. We learn much more the second time we do something. Use the exercises and additional self-checks below to practice.

1. Multiplying Two Numbers

Review the code, then answer the questions below.

function multiplyNumbers(firstNumber=2, secondNumber=4){
    let product = firstNumber * secondNumber;
    return product;
}

let foo = multiplyNumbers(3,12);

let bar = multiplyNumbers(15,4);

let baz = multiplyNumbers("two","three");

2. Calculating Area of a Box

function calculateArea(length, width, units="sq ft"){
    let area = length * width;
    return `${area} ${units}`;
}

let boxLength = 5;
let boxHeight = 12;

let boxArea = calculateArea(boxLength, boxHeight);

3. Scoping Variables

let myText,
    processedText;

const stopWords = { // stopWords is an Object defining words that should not be capitalized.
    'of': true,
    'the': true,
    'a': true,
    'an': true,
    'and': true,
    'to': true
}


function capitalizeText(text){
    // This function expects a String of text. It breaks apart the String into an 
    // Array of words, then it capitalizes the first letter of each word. Once it has
    // capitalized all words, it returns a new String with capitalized text.

    let wordArray = text.split(' '); // Split on space characters.
    let newWordArray = []; // Initialize an Array to store results.

    for (word of wordArray){
        if (!stopWords[word]){ // Check to make sure word is not in stopwords list.
            let newFirstLetter = word[0].toUpperCase(); // Change first letter in `word` to uppercase.
            let slicedWord = word.slice(1); // Get the rest of the word after the first letter.
            let newWord = newFirstLetter + slicedWord; // Put the word back together.
            newWordArray.push(newWord); // Add the newWord to the newWordArray of capitalized words.
        } else {
            newWordArray.push(word); // If we hit a stopWord, just put that word back in the list without altering.
        }
    }

    var newText = newWordArray.join(' ');
    return newText; // Return the string.
}

myText = "association of code writers";
processedText = capitalizeText(myText);
console.log(processedText);