JavaScript practiceJavaScript Output Practice
JavaScript output questions help you slow down and understand how the language evaluates code. Practice predicting results from small snippets before building larger features.
Example practice questions
Try these samples, then continue into the JavaScript Practice Labfor guided browser-based practice.
1
What does console.log(2 + 3 * 4) print?
Answer: 14
2
What does console.log('5' + 2) print?
Answer: 52
3
What does console.log([10, 20, 30][0]) print?
Answer: 10
4
What does console.log(Boolean('false')) print?
Answer: true
5
What does console.log('hello'.length) print?
Answer: 5
6
What does console.log(7 % 3) print?
Answer: 1
7
What does console.log(typeof 42) print?
Answer: number