# How do I check if a value is an integer in JavaScript without using Math.floor()?Davide Sconst 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)}}

To check if a value is an integer in JavaScript without using`Math.floor()`, you can use the following approaches: 1. Using the Number.isInteger() method: The most straightforward and recommended way to check if a value is an integer is by using the`Number.isInteger()` method. It returns`true` if the value is an integer and`false` otherwise.

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``````
const value = 42;
const isInteger = Number.isInteger(value);
console.log(isInteger); // Output: true
``````

This method is preferred because it explicitly checks if the value is of the number type and if it has no fractional or decimal part. 2. Using the modulo operator: Another approach to check if a value is an integer is by using the modulo (%) operator. An integer value divided by 1 will have no remainder. You can check if the value modulo 1 equals 0.

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``````
const value = 42;
const isInteger = value % 1 === 0;
console.log(isInteger); // Output: true
``````

This approach works because if the value is an integer, the remainder of the division will be 0. 3. Using bitwise operations: You can also leverage bitwise operators to check if a value is an integer. Performing a bitwise operation like shifting the value left by 0 bits (<< 0) or using a bitwise OR operation (| 0) will convert the value to a 32-bit signed integer. If the value remains the same after the operation, it is an integer.

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``````
const value = 42;
const isInteger = (value << 0) === value;
console.log(isInteger); // Output: true
``````

However, this approach should be used with caution as it may have unintended side effects if the value is outside the range of 32-bit integers or if it contains non-numeric characters. These methods allow you to check if a value is an integer in JavaScript without relying on`Math.floor()`. However, it's generally recommended to use`Number.isInteger()` for clarity and reliability, as it specifically checks if a value is an integer.