I'm very new to Swift and trying to figure out how to count up within a for loop. For example, why doesn't something like this work? I want it to print the new age +1 12 times over......
So ultimately it would read: I am now 36 years old I am now 37 years old etc...
var myAge = 35
for _ in 1...20{
print("I am now \(myAge += 1) years old")
}
Swift does not support the syntax myAge += 1 inside string interpolation. You can do myAge++ instead.
var myAge = 35
for _ in 1...20 {
print("I am now \(myAge++) years old")
}
myAge += 1 on its own line inside the for loop, then print out myAge inside the print statement.String interpolation attempts to describe a value, not evaluate an expression. Technically, it interpolates the result of calling .description - a String - on anything that conforms to CustomStringConvertible. See How can I change the textual representation displayed for a type in Swift?
So, considering it as a value, rather than an expression, what type do you expect myAge += 1 to be? If you add it explicitly, thus:
var myAge = 35
for _ in 1...20 {
let x = (myAge += 1)
print("I am now \(x) years old")
}
you will see that the compiler warns you :
"Constant x inferred to have type '()', which may be unexpected."
The code below works, apparently the print() constructor doesn't support +=, but you can update the value and then print your results.
var myAge = 35
for _ in 1...20{
myAge += 1
print("I am now \(myAge) years old")
}
