The `if` Statement
A conditional statement, also known as an if-statement, can be used to execute specific lines of code based on the result of a boolean expression.
The syntax of a conditional statement is:
if (boolean_expression)
{
// some code here …
}
Here boolean_expression can be any expression which defines a condition. The code between the curly brackets ({}) is executed if the boolean_expression evaluates to true.
The code enclosed between the curly brackets ({}) is collectively referred to as a Code Block.
For example:
12345let age = 18; if(age >= 18) { console.log("The user is old enough to drive."); }
We can have multiple if-statements in a program, giving us more control over which code block to execute. For example, we can further extend the previous code to output a different statement if the age is less than 18:
123456789let age = 17; if(age >= 18) { console.log("The user is old enough to drive."); } if(age < 18) { console.log("The user is not old enough to drive"); }
1. What is a conditional statement used for in JavaScript?
2. What is the correct syntax for an if statement?
3. What will be the output of the following code?
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A conditional statement, also known as an if-statement, can be used to execute specific lines of code based on the result of a boolean expression.
The syntax of a conditional statement is:
if (boolean_expression)
{
// some code here …
}
Here boolean_expression can be any expression which defines a condition. The code between the curly brackets ({}) is executed if the boolean_expression evaluates to true.
The code enclosed between the curly brackets ({}) is collectively referred to as a Code Block.
For example:
12345let age = 18; if(age >= 18) { console.log("The user is old enough to drive."); }
We can have multiple if-statements in a program, giving us more control over which code block to execute. For example, we can further extend the previous code to output a different statement if the age is less than 18:
123456789let age = 17; if(age >= 18) { console.log("The user is old enough to drive."); } if(age < 18) { console.log("The user is not old enough to drive"); }
1. What is a conditional statement used for in JavaScript?
2. What is the correct syntax for an if statement?
3. What will be the output of the following code?
Дякуємо за ваш відгук!
