Math.ceil() vs Math.floor()
Math.ceil() and Math.floor() are both JavaScript Math APIs, and choosing between them is a common point of confusion. This page compares their syntax, parameters, return values, and typical use cases so you can pick the right one. Math.ceil(): Rounds up to the nearest integer. Its syntax is Math.ceil(x). Math.floor(): Rounds down to the nearest integer. Its syntax is Math.floor(x). Example of Math.ceil(): Math.ceil(1.2) // 2. Example of Math.floor(): Math.floor(1.9) // 1. Read the full references for Math.ceil() and Math.floor() to see edge cases, time complexity, browser support, and the mistakes developers most often make with each. Other Math APIs worth comparing: Math.abs(), Math.round(), Math.trunc(), Math.max(), Math.min(), Math.random(). Both belong to the Math category in the JS Reference documentation, which covers 43 entries in total. Try both in the JavaScript playground to see the behavioral difference live.