[{"data":1,"prerenderedAt":346},["ShallowReactive",2],{"bnPUIOMQPK":3},[4],{"id":5,"date":6,"date_gmt":7,"guid":8,"modified":10,"modified_gmt":11,"slug":12,"status":13,"type":14,"link":15,"title":16,"content":18,"excerpt":21,"author":23,"featured_media":24,"comment_status":25,"ping_status":25,"sticky":20,"template":26,"format":27,"meta":28,"categories":30,"tags":32,"class_list":33,"acf":41,"yoast_head":42,"yoast_head_json":43,"featured_media_src_url":137,"_links":138,"_embedded":186},1574,"2025-06-15T14:32:44","2025-06-15T11:32:44",{"rendered":9},"https://api.aoskin.ru/?p=1574","2025-07-26T19:18:32","2025-07-26T16:18:32","javascript-v-dejstvii-poleznye-funkczii-chisla","publish","post","https://api.aoskin.ru/javascript-v-dejstvii-poleznye-funkczii-chisla/",{"rendered":17},"JavaScript в действии: полезные функции [Числа]",{"rendered":19,"protected":20},"\n\u003Ch2 class=\"wp-block-heading\">Преобразование строки в число\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Обычно, чтобы преобразовать строку в число используется функция \u003Ccode>Number()\u003C/code>. Альтернативный вариант использовать метод \u003Ccode>parseInt()\u003C/code> или \u003Ccode>parseFloat()\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Number('55') // 55\nparseInt('55px') // 55\nparseFloat('55.5px') // 55.5\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">\u003Ccode>Number()\u003C/code> – строгое преобразование(преобразует всю строку целиком), если в строке есть \u003Cstrong>любой посторонний символ\u003C/strong>, результат будет \u003Ccode>NaN\u003C/code>, учитывает пробелы \u003Cstrong>в начале и конце\u003C/strong>, но \u003Cstrong>не допускает текст внутри\u003C/strong> строки:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Number("55")      // 55\nNumber("  55  ")  // 55\nNumber("55px")    // NaN \nNumber("55.5")    // 55.5\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">\u003Ccode>parseInt()\u003C/code> – более свободное преобразование(ищет \u003Cstrong>целое число\u003C/strong> в начале строки), игнорирует \u003Cstrong>всё, что после числа\u003C/strong> (включая пробелы, текст и т.д.), может возвращать \u003Ccode>NaN\u003C/code>, если число не найдено \u003Cstrong>в начале строки\u003C/strong>, поддерживает второй параметр – \u003Cstrong>основание системы счисления\u003C/strong>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>parseInt("55px")       // 55\nparseInt("  55 days")  // 55\nparseInt("px55")       // NaN\nparseInt("08", 10)     // 8\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">\u003Ccode>parseFloat()\u003C/code> – как \u003Ccode>parseInt\u003C/code>(), но с дробной частью(ищет \u003Cstrong>дробное число\u003C/strong> в начале строки), игнорирует всё, что после числа, пробелы \u003Cstrong>в начале\u003C/strong> допускаются, \u003Cstrong>внутри числа – нет\u003C/strong>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>parseFloat("55.5")       // 55.5\nparseFloat("55.5px")     // 55.5\nparseFloat("  55.5rem")  // 55.5\nparseFloat("55. 5")      // 55\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Генерация случайного числа\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">\u003Ccode>Math.random()\u003C/code> – данный метод позволяет генерировать значения с плавающей точкой в диапазоне от 0 до 1:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Math.random(); // 0.6938128578941894\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Если необходимо ограничение в диапазоне случайного целого числа например в диапазоне до 6, чтобы получить целое число – используем\u003Ccode> Math.floor()\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const randomInt = () =>  Math.floor(Math.random() * 6) + 1;\nrandomInt(); // 4\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Если необходимо ограничение в диапазоне случайного числа от минимального до максимального, можно использовать следующее:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const randomInt = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;\nrandomInt(4, 15); // 6\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Проверка значения числа\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Проверка, является ли число целым:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Number.isInteger(3);     // true\nNumber.isInteger(3.14);  // false\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Проверка, является ли значение конечным числом (не \u003Ccode>Infinity\u003C/code>, не \u003Ccode>NaN\u003C/code>):\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Number.isFinite(100);        // true\nNumber.isFinite(Infinity);   // false\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Фиксированное количество знаков после запятой\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Метод \u003Ccode>.toFixed()\u003C/code> позволяет указать количество символов после дробной части и возвращает значение в строке, чтобы получить число можно использовать \u003Ccode>+\u003C/code> либо \u003Ccode>Number()\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>(3.14159).toFixed(2);          // "3.14" string\n+(3.14159).toFixed(2);         // 3.14 number\nNumber((3.14159).toFixed(2));  // 3.14 number\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Округление чисел\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Метод \u003Ccode>Math.round()\u003C/code> – округляет число в до ближайшего целого, 0.5 и выше – увеличение, меньше 0.5 – уменьшение:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Math.round(4.78);  // 5\nMath.round(4.48);  // 4\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Метод \u003Ccode>Math.floor()\u003C/code> – округляет число в меньшую сторону даже при отрицательном значении:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Math.floor(4.5);  // 4\nMath.floor(4.1);  // 4\nMath.floor(-4.5); // -5\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Метод \u003Ccode>Math.ceil()\u003C/code> – округляет число в большую сторону:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Math.ceil(4.1);   // 5\nMath.ceil(4.9);   // 5\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Метод \u003Ccode>Math.trunc()\u003C/code> – отбрасывает дробную часть:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>Math.trunc(4.5);   // 4\nMath.trunc(-4.5);  // -4\nMath.trunc(3.14);  // 3\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Работа с большими числами в формате \u003Ccode>BigInt\u003C/code>\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Чтобы обрабатывать большие числа без потери точности, необходимо использовать тип данных \u003Ccode>BigInt\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const maxInteger = Number.MAX_SAFE_INTEGER;  // 9007199254740991\nconst bigInteger = BigInt(maxInteger);\nbigInteger + 4n;                             // 9007199254740995n\nbigInteger + 5n;                             // 9007199254740996n\nbigInteger + 6n;                             // 9007199254740997n\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Геометрические преобразования\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Все стандартные тригонометрические функции (\u003Ccode>Math.sin\u003C/code>, \u003Ccode>Math.cos\u003C/code>, \u003Ccode>Math.tan\u003C/code> и т.д.) работают \u003Cstrong>только с радианами\u003C/strong>, вот пример как можно преобразовать градусы в радианы и наоборот.\u003C/p>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Чтобы преобразовать градусы в радианы, нужно умножить значение в градусах на \u003Ccode>(Math.PI / 180)\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const radians = degrees * (Math.PI / 180);\n\nconst toRadians = (deg) => deg * (Math.PI / 180);\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Например, чтобы получить значение угла в 45 градусов, необходимо сделать следующее:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const radians = 45 * (Math.PI / 180);\nradians(); // 0.7853981633974483\n\nconst toDegrees = (rad) => rad * (180 / Math.PI);\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Чтобы преобразовать радианы в градусы, нужно умножить значение в радианах на \u003Ccode>(180 / Math.PI)\u003C/code>:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const degrees = radians * (180 / Math.PI);\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Чтобы получить длину дуги окружности необходимо умножить радиус окружности на угол дуги в радианах. Например угол дуги – 90 градусов, радиус окружности – 2:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>const degrees = 120;\nconst radius = 2;\nconst radians = degrees * (Math.PI / 180);\nconst lengthArc = radians * radius;\nlengthArc(); // 4.1887902047863905\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Заключение\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">JavaScript даёт всё, что нужно для удобной работы с числами – важно просто помнить об этих функциях и применять их осознанно. Особенно валидация входных данных и округление – одни из самых частых ошибок в реальных проектах.\u003C/p>\n",false,{"rendered":22,"protected":20},"\u003Cp>Работа с числами неотъемлемая часть любой frontend-разработки. Рассмотрим полезные и часто используемые функции для работы с числами в JavaScript.\u003C/p>\n",1,1589,"open","","standard",{"_acf_changed":20,"_yoast_wpseo_focuskw":26,"_yoast_wpseo_title":26,"_yoast_wpseo_metadesc":29,"footnotes":26},"%%sep%% Работа с числами неотъемлемая часть любой frontend-разработки. Рассмотрим полезные и часто используемые функции для работы с числами.",[31],17,[],[34,14,35,36,37,38,39,40],"post-1574","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript",[],"\u003C!-- This site is optimized with the Yoast SEO plugin v28.5 - https://yoast.com/product/yoast-seo-wordpress/ -->\n\u003Ctitle>JavaScript в действии: полезные функции [Числа]\u003C/title>\n\u003Cmeta name=\"description\" content=\"- Работа с числами неотъемлемая часть любой frontend-разработки. 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