Логические операторы JavaScript

Введение

В области JavaScript, логические операторы являются ключевыми инструментами в процессах принятия решений. Они оценивают несколько условий и операндов, возвращая булевы значения (истина или ложь) на основе логики. Основные логические операторы в JavaScript:

|| (ИЛИ)
&& (И)
! (НЕ)

Оператор || (ИЛИ)

Оператор || (ИЛИ) проверяет несколько условий и возвращает true если хотя бы одно условие истино. Если все условия ложны, он возвращает false.

Синтаксис и примеры

let result = value1 || value2 || value3;
// Returns the first truthy value or the last value if all are falsy

Пример 1: Базовое использование

1
console.log(true || false); // true
 
 
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Пример 2: Поиск первого истинного значения

1
console.log(0 || "Hello" || false); // "Hello"
 
 
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Оператор && (И)

Оператор && (И) обеспечивает истинность всех условий. Он возвращает true только если все операнды истинны; в противном случае он возвращает false.

Синтаксис и примеры

let result = value1 && value2 && value3;
// Returns the first falsy value or the last value if all are truthy

Пример 1: Оценка нескольких условий

1
console.log(true && "Hello"); // "Hello"
 
 
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Пример 2: Первое ложное значение

1
console.log(0 && true); // 0
 
 
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Оператор ! (НЕ)

Оператор ! (НЕ) инвертирует булево значение операнда, превращая true в false и наоборот.

Синтаксис и примеры

let result = !value;

Пример: Инверсия булева значения

1
console.log(!true); // false
 
 
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Заключение

Логические операторы в JavaScript предоставляют эффективный способ обработки сложных логических условий. Овладение ими критически важно для эффективного принятия решений в вашем коде. Практикуйтесь в использовании этих операторов в различных комбинациях, чтобы улучшить свои навыки программирования на JavaScript.

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