JavaScript If-Else Statement: Three Forms Explained for Beginners

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The JavaScript if-else statement allows developers to execute code based on whether a condition evaluates to true or false. The basic if statement runs a block of code only when a given expression is true. The if-else form extends this by providing an alternative block that executes when the condition is false. The if-else-if chain allows multiple conditions to be tested in sequence, executing the block corresponding to the first true expression. If none of the expressions are true, a final else block can serve as a default fallback.

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