js round down to nearest integer code example

Example 1: round down the number javascript

+3.5 => +3.0
-3.5 => -4.0

+3.5 => +3.0 using Math.floor()
-3.5 => -3.0 using Math.ceil()

Example 2: javascript floor

Math.floor(1.6);

result: 1

Example 3: calculate surface of a circle round to the nearest integer javascript

Math.round(Math.PI * radius * radius)