4) Debugging.js

// Use the JavaScript Console to Check the Value of a Variable
let a = 5;
let b = 1;
a++;

let sumAB = a + b;
console.log(a);
console.log(b);
console.log(sumAB);

// Understanding the Differences between the freeCodeCamp and Browser Console
let output = "Get this to show once in the freeCodeCamp console and not at all in the browser console";
console.log(output);
console.clear();

// Use typeof to Check the Type of a Variable
let seven = 7;
let three = "3";
console.log(seven + three);
console.log(typeof seven);
console.log(typeof three);

// Catch Misspelled Variable and Function Names
let receivables = 10;
let payables = 8;
let netWorkingCapital = receivables - payables; 
console.log(`Net working capital is: ${netWorkingCapital}`);

// Catch Unclosed Parentheses, Brackets, Braces and Quotes
let myArray = [1, 2, 3];
let arraySum = myArray.reduce((previous, current) =>  previous + current);
console.log(`Sum of array values is: ${arraySum}`);

// Catch Mixed Usage of Single and Double Quotes
let innerHtml = "<p>Click here to <a href='#Home'>return home</a></p>";
console.log(innerHtml);

// Catch Use of Assignment Operator Instead of Equality Operator
let x = 7;
let y = 9;
let result = "to come";

if(x === y) {
    result = "Equal!";
    }
else {
    result = "Not equal!";
    }
console.log(result);

// Catch Missing Open and Closing Parenthesis After a Function Call
function getNine() {
    let x = 6;
    let y = 3;
    return x + y;
    }
let result1 = getNine();
console.log(result1);

// Catch Arguments Passed in the Wrong Order When Calling a Function
function raiseToPower(b, e) {
    return Math.pow(b, e);
}
let base = 2;
let exp = 3;
let power = raiseToPower(base, exp);
console.log(power);

// Catch Off By One Errors When Using Indexing
function countToFive() {
    let firstFive = "12345";
    let len = firstFive.length;
    for (let i = 0; i < len; i++) {
    console.log(firstFive[i]);
    }
}

countToFive();

// Use Caution When Reinitializing Variables Inside a Loop
function zeroArray(m, n) {
    let newArray = [];
    let row = [];
    for (let i = 0; i < m; i++) {
    row = [];
    for (let j = 0; j < n; j++) {
    row.push(0);
    }
    newArray.push(row);
    }
    return newArray;
}
let matrix = zeroArray(3, 2);

// Prevent Infinite Loops with a Valid Terminal Condition
function myFunc() {
    for (let i = 1; i <= 4; i += 2) {
    console.log("Still going!");
    }
}