Learn JavaScript

deactivated user

Level 70

Ready to learn Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

Ignore?

true or false

Booleans

Boolean(expression);

finds out if an expression (or a variable) is true

false

Boolean(0);

false

Bolean(-0);

false

Boolean("");

false

Boolean(undefined);

false

Boolean(null);

false

Boolean(NaN);