Opérateurs Logiques en JavaScript

Introduction

Dans le monde de JavaScript, les opérateurs logiques sont des outils essentiels dans les processus de prise de décision. Ils évaluent plusieurs conditions et opérandes, renvoyant des valeurs booléennes (vrai ou faux) en fonction de la logique. Les principaux opérateurs logiques en JavaScript sont:

|| (OU)
&& (ET)
! (NON)

L'opérateur || (OU)

L'opérateur || (OU) vérifie plusieurs conditions et renvoie true si au moins une condition est vraie. Si toutes les conditions sont fausses, il renvoie false.

Syntaxe et Exemples

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

Exemple 1: Utilisation de base

1
console.log(true || false); // true
 
 
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Exemple 2: Trouver la première valeur vraie

1
console.log(0 || "Hello" || false); // "Hello"
 
 
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L'opérateur && (ET)

L'opérateur && (ET) s'assure que toutes les conditions sont vraies. Il renvoie true uniquement si tous les opérandes sont vrais; autrement, il renvoie false.

Syntaxe et Exemples

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

Exemple 1: Évaluation de conditions multiples

1
console.log(true && "Hello"); // "Hello"
 
 
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Exemple 2: Première valeur fausse

1
console.log(0 && true); // 0
 
 
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L'opérateur ! (NON)

L'opérateur ! (NON) inverse la valeur booléenne d'un opérande, transformant true en false et vice versa.

Syntaxe et Exemples

let result = !value;

Exemple: Inversion booléenne

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

Les opérateurs logiques en JavaScript fournissent une manière efficace de gérer des conditions logiques complexes. Maîtriser ces opérateurs est crucial pour une prise de décision efficace dans votre code. Pratiquez l'utilisation de ces opérateurs dans diverses combinaisons pour améliorer vos compétences en programmation JavaScript.

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