In Scala, the if statement can also be used as an expression that returns a value. This is referred to as an if-else expression, which can be used for conditional assignment using the val keyword.
Here's an example:
// Assigning a value based on a condition
val x = if (2 + 2 == 4) 42 else 0
// Printing the value of x
println(x)
In this example, the if condition checks whether 2 + 2 is equal to 4. If this condition is true, then the value of x is assigned to 42. Otherwise, the value of x is assigned to 0. Finally, the value of x is printed.
We can also use the if statement as an expression in a block of code. Here's an example:
// Conditional assignment using if expression in a block
val y =
if (2 + 2 == 4) {
// block of code
val z = 42
z * 2
} else {
// block of code
val z = 0
z * 2
}
// Printing the value of y
println(y)
In this example, the if condition checks whether 2 + 2 is equal to 4. If this condition is true, then a block of code is executed, which includes the assignment of z to 42. The value of z multiplied by 2 is returned and assigned to y. Otherwise, a different block of code is executed, which includes the assignment of z to 0. The value of z multiplied by 2 is returned and assigned to y. Finally, the value of y is printed.