Math.trunc(): fraction removal

Useful to know

Math.trunc() removes the fractional part of a number. Math.trunc(3.9) is 3, and Math.trunc(-3.9) is -3. For negative inputs this differs from Math.floor(). [1]

Use it when the task is actually a cutoff, not the nearest integer. For example, showing only the whole completed units may require such a result, but a negative deficiency is interpreted separately. The clear name of the operation helps when reviewing code: "whole part", "lower bound" and "rounded" are not interchangeable concepts.