Conditionals
Make decisions in your code with conditional statements. Learn if/else statements, switch cases, ternary operators, and logical operators. Control program flow based on different conditions and user input.
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What You'll Learn
If, else if, and else statements
Switch and case statements
Ternary operator (? :)
Logical operators (&&, ||, !)
Comparison operators (==, ===, <, >)
Truthy and falsy values
Frequently Asked Questions
What is the difference between == and === in JavaScript?
== performs type coercion and checks for value equality, while === checks for both value and type equality (strict equality). Use === to avoid unexpected type conversion bugs.
When should I use a switch statement instead of if/else?
Use switch statements when comparing one variable against multiple specific values. They are more readable than long if/else chains for exact value matching. Use if/else for complex conditions or range comparisons.
What are truthy and falsy values?
In JavaScript, falsy values include false, 0, empty strings, null, undefined, and NaN. Everything else is truthy. This matters in conditions where non-boolean values are evaluated as true or false.
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