Оператори та порівняння
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Operators let you perform calculations and compare values. Types of Operators
- Arithmetic:
+,-,*,/,%; - Assignment:
=,+=,-=; - Comparison:
==,===,!=,!==,>,<,>=,<=.
12345678910111213// 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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Оператори та порівняння
Operators let you perform calculations and compare values. Types of Operators
- Arithmetic:
+,-,*,/,%; - Assignment:
=,+=,-=; - Comparison:
==,===,!=,!==,>,<,>=,<=.
12345678910111213// 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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