 # What are the differences between parseInt() and parseFloat() in JavaScript?Alex K  const 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)}}

In JavaScript,`parseInt()` and`parseFloat()` are built-in functions used to convert strings to numeric values. Although they serve a similar purpose, there are some key differences between them. Here's a detailed explanation of the differences: 1. Parsing Integers vs. Parsing Floats: -`parseInt()`: -`parseInt()` is used to parse and convert a string into an integer value. It extracts and returns the whole number part of the string, discarding any decimal places. -`parseFloat()`: -`parseFloat()` is used to parse and convert a string into a floating-point number value. It extracts and returns both the whole number and decimal part of the string. 2. Handling Decimal Places: -`parseInt()`: -`parseInt()` ignores any decimal places in the input string. It only returns the whole number portion, truncating any decimal values. -`parseFloat()`: -`parseFloat()` considers and preserves the decimal places in the input string. It returns the number as a floating-point value, including any decimal portion. 3. Numeric String Format: -`parseInt()`: -`parseInt()` assumes the input string is in whole number format, potentially prefixed with a sign (+/-). It stops parsing as soon as it encounters a non-numeric character or the end of the string. -`parseFloat()`: -`parseFloat()` assumes the input string may contain both whole and fractional numbers, potentially prefixed with a sign (+/-). It continues parsing until it encounters an invalid character or the end of the string. 4. NaN and Invalid Strings: -`parseInt()`: - If the input string cannot be parsed into an integer value,`parseInt()` returns`NaN` (Not a Number). However, it can still return a valid number if the string starts with a valid numeric sequence. -`parseFloat()`: - If the input string cannot be parsed into a floating-point number,`parseFloat()` returns`NaN`. Similarly, it can return a valid number if the string starts with a valid numeric sequence. 5. Base Radix: -`parseInt()`: -`parseInt()` allows you to specify an optional second parameter, called the radix, which indicates the base of the input string. The radix can be any integer from 2 to 36. If not specified,`parseInt()` assumes a radix of 10. -`parseFloat()`: -`parseFloat()` does not support the radix parameter. It always assumes a decimal (base 10) representation. Here are some examples that demonstrate the differences between`parseInt()` and`parseFloat()`:

``````1
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``````
const numericString = '10.45';

const parsedInteger = parseInt(numericString);      // Output: 10
const parsedFloat = parseFloat(numericString);      // Output: 10.45

const invalidString = 'Hello, World!';

const invalidInteger = parseInt(invalidString);      // Output: NaN
const invalidFloat = parseFloat(invalidString);      // Output: NaN
``````

In these examples, the input string`'10.45'` is parsed using both`parseInt()` and`parseFloat()`, resulting in the differences mentioned above. Similarly, an invalid string`'Hello, World!'` is also parsed, resulting in`NaN` values for both functions. Consider these differences when choosing between`parseInt()` and`parseFloat()` based on your specific use case and the desired behavior for parsing numeric strings in your JavaScript code.