Getting started Swift types
Int Integer, whole number that does not containing any floating point information.
Float 32bit number with floating point information
Double 64bit number with floating point information
Bool true or false
String represents text
Character Single unicode character
There are more types but those are the most common in Swift.
Swift Types and the types you defined should be UpperCamelCase. Same in Groovy. However, in Groovy we have access to java primitives short, int , long, float, double, byte, char, boolean etc. Those are lowercase.
If we don’t explicitly defined a type both Swift and Groovy will try to infer it.
let i = 42 // Int let d = 42.5 // Double
def i = 42 // java.lang.Integer def d = 42.5 // java.math.BigDecimal
Define type explicitly
let i: Int = 42 let d: Double = 42.5
Integer i = 42 Double d = 42.5
let d: Double = 42.5 let i: Int = Int(d) // 42
final Double d = 42.5 // java.lang.Double final Integer i = (Integer)42.5 // 42 java.lang.Integer final Integer x = 42.5 as Integer // 42 java.lang.Integer
as keyword in Swift
If the default inferred type is not what you are looking for, you convert value to type with the as keyword
let x = 42 as Double
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