← GlossaryWas this page helpful?
What does "typeof" mean in programming?
typeof is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
A JavaScript operator that returns a string indicating the type of a value at runtime. Possible results include 'string', 'number', 'boolean', 'object', 'function', and 'undefined'.
Example
"if (typeof value === 'string') { /* safe to call string methods */ }"
Can you put this sentence in the right order?
Tap the words to place them here
Keep building your technical English
You just looked up what this word means. Lingua-e turns vocabulary like this into full practice: fill-in-the-blanks, listening, and real developer conversations.
Practice this for free