 # How can I convert a string to an integer in JavaScript?Antek N  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, you can convert a string to an integer using various methods. Here are some common approaches: 1. Using the`parseInt()` function: - The`parseInt()` function parses a string and returns an integer. It takes two arguments: the string to be parsed and an optional radix (base). If the radix is not specified, it assumes a base 10 (decimal) conversion.

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const string = "42";
const integer = parseInt(string);
``````

In this example,`parseInt(string)` converts the string`"42"` to the integer`42`. Note that`parseInt()` only extracts and parses the numeric part of the string until it encounters a non-numeric character. If the string starts with a non-numeric character, or if it contains characters that are not valid in the specified radix,`parseInt()` returns`NaN` (Not a Number). 2. Using the unary plus operator (+): - The unary plus operator converts a string into a numeric value. When applied to a string, it tries to convert the string to a number, including integers.

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const string = "42";
const integer = +string;
``````

Here,`+string` converts the string`"42"` to the integer`42`. If the string cannot be converted to a number, the unary plus operator returns`NaN`. 3. Using the`Number()` constructor: - The`Number()` constructor can be used to convert a string to a number. When called with the`new` keyword, it creates a new Number object. When called without`new`, it performs a conversion.

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const string = "42";
const integer = Number(string);
``````

In this example,`Number(string)` converts the string`"42"` to the integer`42`. If the string cannot be converted to a number,`Number()` returns`NaN`. 4. Using the`parseInt()` function with a radix: - If the string represents a number in a different base, such as binary or hexadecimal, you can specify the radix as the second argument to`parseInt()`.

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const string = "1010";
const binaryInteger = parseInt(string, 2); // Binary conversion
``````

Here,`parseInt(string, 2)` converts the binary string`"1010"` to the integer`10`. By specifying the radix, you can convert strings representing numbers in different bases, such as binary (base 2), octal (base 8), or hexadecimal (base 16), to integers. Choose the method that best suits your requirements.`parseInt()` is commonly used for general string-to-integer conversions, while the unary plus operator and`Number()` constructor provide more concise alternatives. If you need to convert numbers in different bases, use`parseInt()` with a specified radix.