# What are the differences between JavaScript's Math.floor() and Math.ceil() functions?Benjamin Cconst t="undefined"!=typeof HTMLImageElement&&"loading"in HTMLImageElement.prototype;if(t){const t=document.querySelectorAll("img[data-main-image]");for(let e of t){e.dataset.src&&(e.setAttribute("src",e.dataset.src),e.removeAttribute("data-src")),e.dataset.srcset&&(e.setAttribute("srcset",e.dataset.srcset),e.removeAttribute("data-srcset"));const t=e.parentNode.querySelectorAll("source[data-srcset]");for(let e of t)e.setAttribute("srcset",e.dataset.srcset),e.removeAttribute("data-srcset");e.complete&&(e.style.opacity=1,e.parentNode.parentNode.querySelector("[data-placeholder-image]").style.opacity=0)}}

The`Math.floor()` and`Math.ceil()` functions in JavaScript are used to round numbers down and up, respectively. Here are the differences between these two functions: 1. Rounding Down (Math.floor()): - The`Math.floor()` function rounds a number down to the nearest integer that is less than or equal to the given value. - It returns the largest integer less than or equal to the given value. - For positive numbers, it simply removes the decimal part. - For negative numbers, it rounds towards negative infinity. - Example:`Math.floor(4.9)` returns`4`,`Math.floor(-2.1)` returns`-3`. 2. Rounding Up (Math.ceil()): - The`Math.ceil()` function rounds a number up to the nearest integer that is greater than or equal to the given value. - It returns the smallest integer greater than or equal to the given value. - For positive numbers, it rounds towards positive infinity. - For negative numbers, it simply removes the decimal part. - Example:`Math.ceil(4.1)` returns`5`,`Math.ceil(-2.9)` returns`-2`. In summary, the main difference between`Math.floor()` and`Math.ceil()` lies in the direction of rounding.`Math.floor()` always rounds down, while`Math.ceil()` always rounds up.