Lesson 3 of 4 · 9 minutes

Comparing values

Conditions often compare values. Comparison operators ask questions: === means equal, > greater than, < less than, and >= or <= include equality.

Every comparison gives a boolean: true or false.

Be careful: a single = puts a value in a box. === checks whether two values are equal. Use === in a condition.

Comparison asks a question. Assignment fills a box.

Predict first: will each line print true or false?

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Quick check

How do you check whether age equals 18?

if (age === 18)if (age = 18)if (age > 18)

Choose one answer.

What is the difference between = and ===?

= assigns a value; === compares two values.They are the same.= is for numbers and === is for text.

Choose one answer.

You can now build conditions by comparing values — and you know why = and === must not be swapped.