Lernen Operatoren und Vergleiche

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Operators let you perform calculations and compare values. Types of Operators

Arithmetic: +, -, *, /, %;
Assignment: =, +=, -=;
Comparison: ==, ===, !=, !==, >, <, >=, <=.


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// Comparing with == (loose equality) vs === (strict equality)
console.log(5 == "5"); // true, because == does type conversion
console.log(5 === "5"); // false, because === checks both value and type

// Not equal operators
console.log(5 != "5"); // false, because == type conversion makes them equal
console.log(5 !== "5"); // true, different types

// Greater than, less than, greater than or equal to, less than or equal to
console.log(7 > 3); // true
console.log(2 < 1); // false
console.log(4 >= 4); // true
console.log(9 <= 10); // true

When you use comparison operators, JavaScript evaluates the values as either truthy or falsy. A truthy value is any value that is considered true when evaluated in a Boolean context, while a falsy value is one that is considered false. The most common falsy values in JavaScript are:

false;
0 (the number zero);
"" (empty string);
null;
undefined;
NaN (not a number).

All other values are considered truthy.

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Abschnitt 1. Kapitel 6