Output using console.log in Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does console.log() do in JavaScript?

console.log() prints messages or values to the browser's console. It's like writing a note to yourself to check what your program is doing.

beginner

How do you print the text "Hello, world!" using console.log()?

Use console.log('Hello, world!'); to show the message in the console.

beginner

Can console.log() print numbers and variables?

<p>Yes! You can print numbers like <code>console.log(123);</code> or variables like <code>let x = 5; console.log(x);</code>.</p>

beginner

What will this code print?<br>

console.log(2 + 3);

It will print 5 because it adds the two numbers and shows the result.

beginner

Why is console.log() useful when learning to code?

It helps you see what your program is doing step-by-step, like checking your work on a homework problem.

What does console.log('Hi!'); do?

A Stops the program

B Saves 'Hi!' to a file

C Prints 'Hi!' to the console

D Shows a popup message

console.log() prints messages to the console, so it will show 'Hi!'.

Which is the correct way to print the number 10?

A console.log('10');

B console.log(10);

C console.print(10);

D print.console(10);

Use console.log(10); to print the number 10 as a number, not as text.

What will console.log(4 * 5); output?

A 20

B 45

C 9

D Error

It multiplies 4 by 5 and prints 20.

How do you print the value of a variable name?

A console.print(name);

B console.log('name');

C print(name);

D console.log(name);

Use console.log(name); to print the variable's value, not the word 'name'.

Which of these is NOT true about console.log()?

A It can create popup alerts

B It can print numbers

C It can print variables

D It can print strings

console.log() prints to the console, it does not create popup alerts.

Explain how console.log() helps you see what your JavaScript program is doing.

Think about how you check your work when solving a problem.

Describe how to use console.log() to print a variable and a message together.

Try combining text and variables inside console.log.