1.6 Numeric Comparison

>>>

1 < 1

false

The ==, !=, <, <=, > and >= numeric comparison operators work as expected...

>>>

42 <= 42

true

>>>

4711 >= "4711"

true

Numeric comparison will coerce both operands to numbers.

>>>

NaN == NaN

false

The special NaN (Not A Number) value behaves in a different way.

>>>

isNaN(NaN)

true

Using the built-in isNaN function, this special case can be checked.

>>>

+ "  42  "

With the unary prefix + operator, any value can be coerced into a number.

>>>

+ null

Some results might be expected...

>>>

+ undefined

NaN

...but others not so much

>>>

The console allows you to interact with the course material and examples. Use the following keys:

A special logging function is also available:

Console Learner — An interactive JavaScript course.