Roadmap

    7 - Exercise II

    Exercise 2: Basic Types and Variables

    Objective:

    • Practice defining and using basic types in TypeScript.
    • Implement a function that uses these types to perform a simple task.

    Create a TypeScript File:

    • Create a file named exercise2.ts in your src directory.
    • Open exercise2.ts in your text editor and fill in the ?? marks to complete the following code:
    ts
    // exercise2.ts
    // Part I
    // Write a 'greet' function that checks if a boolean is true then outputs 'Welcome to TypeScript in 2024'
    // Define a string variable
    let ??? = "Welcome to TypeScript!";
    // Define a number variable
    let ??? = 2024;
    // Define a boolean variable
    let ?? = true;
    // Define the greet function that takes the boolean as the input and returns a string
    let greet(??) : ?? {
    	if(??){
    	  return ?? // concatenated string and year
    	}else{
    	 return 'nothing'; // if the boolean is false
    	}
    }
    // Log the output of the greet function
    console.log(greet(isActive));

    Try to complete this exercise yourself with no typescript errors.

    If you can do this without peeking, then you're in a good place to carry on to the next section.

    Solution: 
    ts
        // exercise2.ts
     
        // Part I
     
        // Write a 'greet' function that checks if a boolean is true then outputs 'Welcome to TypeScript in 2024'
     
        // Define a string variable
        let welcomeMessage: string = "Welcome to TypeScript!";
     
        // Define a number variable
        let year: number = 2024;
     
        // Define a boolean variable
        let isActive: boolean = true;
     
        // Define the greet function that takes the boolean as the input and returns a string
        function greet(isActive: boolean): string {
            if(isActive){
                return `${welcomeMessage} in ${year}`; // concatenated string and year
            }else{
                return 'nothing'; // if the boolean is false
            }
        }
     
        // Log the output of the greet function console.log(greet(isActive));