JavaScript Data Types Practice

exercise.md

Javascript Data Types Exercises

Data Types

For each expression, predict what you think the output will be in a comment (//) without first running the command. Then run the expression in the console. Note the actual output in a comment and compare it with your prediction.

You may run these commands inside the Dev Tool console to double check your answer!

Example

typeof("15")
// Prediction: Number
// Actual: String

What is the output of each of the expressions below?

typeof(15)
// Prediction:
// Actual:

typeof(5.5)
// Prediction:
// Actual:

typeof(NaN)
// Prediction:
// Actual:

typeof("hello")
// Prediction:
// Actual:

typeof(true)
// Prediction:
// Actual:

typeof(1 != 2)
// Prediction:
// Actual:


"hamburger" + "s"
// Prediction:
// Actual:

"hamburgers" - "s"
// Prediction:
// Actual:

"1" + "3"
// Prediction:
// Actual:

"1" - "3"
// Prediction:
// Actual:

"johnny" + 5
// Prediction:
// Actual:

"johnny" - 5
// Prediction:
// Actual:

99 * "luftbaloons"
// Prediction:
// Actual:

What's going on in the second half of the previous question? Are there any "rules" we can pull from those examples?