In JavaScript, we use console.log() to write a message (the content of a variable, a given string, etc.) in console. It is mainly used for debugging purposes, ideally to leave a trace of the content of variables during the execution of a program.


console.log("Welcome to Learn JavaScript Beginners Edition");
let age = 30;

Math with console

You can also write math equation in console in order to know the answer to an expression.


console.log("What's the age a decade later?");
let age = 30;
console.log(age + 10);
//returns 40 in the console

Booleans in console

Another useful way developers use console is to check wether something is true or false. For instance in the example below you can check wether the age of a person being equal to 45 is true or false.


console.log("Are they 50 years old?");
let age = 30;
console.log(age === 50);
//result: false

📝 Tasks:

  • Write a program to print Hello World on the console. Feel free to try other things as well!
  • Write a program to print variables to the console.
    1. Declare a variable animal and assign the dragon value to it.
    2. Print the animal variable to the console.
  • Write a program to print the number 45 with a math expression of your choice. (Bonus if one of the numbers is a variable!)

  • Write a program in the console that checks if the amounts of eggs is more than 12.

    1. Declare a variable eggs and assign a number of your choice to it
    2. Call the eggs variable in the console and use the correct operator to see if the number assigned to eggs is greater that 12
      • If the number of eggs is greater, it should print true, if not then it should print false

💡 Hints:

  • Visit the variable chapter to understand more about variables.
  • Visit the operators page to know the possible operators you can use.

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