Rounding

Methods that round a numeric value. They return a new value and never mutate.

.round() → int

Rounds to the nearest integer.

.round(precision) → number

Rounds to precision decimal places.

.floor() → number

Rounds down to the nearest integer.

.ceiling() → number

Rounds up to the nearest integer.

The method is .ceiling(), not ceil. The standalone function form is ceil(n) - see Built-in functions.

log (2.7).round()      // 3
log (3.14159).round(2) // 3.14
log (2.1).ceiling()    // 3
log (2.9).floor()      // 2