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学ぶ The `else` Clause | Section
JavaScript Fundamentals

bookThe `else` Clause

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Conditional Statements have an optional else clause which can be used to specify a block of code to be executed in case the boolean expression evaluates to false.

The syntax is as follows:

if(boolean_expression)
{
  // Code to execute if boolean_expression is true
}
else 
{
  // Code to execute if boolean_expression is false
}

This way we don't need to write multiple if-statements to check for opposite conditions, making the code shorter and neater.

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let age = 18; if(age >= 18) { console.log("The user is old enough to drive."); } else { console.log("The user is not old enough to drive"); }
copy

In the code above, we simply used an else block instead of rewriting a separate if-statement.

1. What is the purpose of the else clause in an if-else statement?

2. What will be the output of the following code?

3. What happens if the if condition evaluates to true?

question mark

What is the purpose of the else clause in an if-else statement?

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question mark

What will be the output of the following code?

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question mark

What happens if the if condition evaluates to true?

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すべて明確でしたか?

どのように改善できますか?

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