VAR.P vs VAR.S – The Difference. The VAR.P Function is based on the formula: Where σ 2 is the population variance; ∑ is a Greek letter called sigma which represents ‘sum’; x i represents each data point; is the mean (average) of the dataset; and. N is the population size (the number of data points in the population). Kotlin has another keyword ” val” to declare the variables. Any variable is declared using var that value can be changed at anytime whereas variable declared with val keyword value can not modified one it is initialized. Mainly val is used to define the constants in kotlin. 2. Variable var examples. var keyword is used in the variable Integer types store whole numbers, positive or negative (such as 123 or -456), without decimals. Valid types are Byte, Short, Int and Long. Floating point types represent numbers with a fractional part, containing one or more decimals. There are two types: Float and Double. If you don't specify the type for a numeric variable, it is most often mSparks 27 March 2016 at 16:50. -> type inference (var/val) The above implementation is fully compilable, and gives you var (save in a file called var.java javac var.java then java var, using it would probably get you fired tho. Since all it does is create a million opportunities for bugs. ->higher-kinded types. Differences between let and var. Called constants also. Called variables also. These are immutable. These are mutable. We use the let keyword to define a constant. We use the var keyword to define a variable. The let keyword cannot be applied to lazy properties. The var keyword is required for lazy properties. This is useful when you want to do something with a value before storing it. In Java you would put that code a constructor body. class Person (firstName: String, lastName: String) { // directly in val / var declarations val firstName = firstName.capitalize () val lastName = lastName // in init blocks val fullName: String init { fullName 1. Arrays can be treated (generally) as pointers but that doesn't mean that they are always interchangeable. As the other said, your p_var points to a literal, something static that cannot be changed. It can point to something else (e.g. p_var = &a_var [0]) but you can't change the original value that you specified by quotes. In Kotlin, a variable or property is either a val or a var instead of like some other languages where a variable is by default mutable and can be restricted with a keyword like final or const. Therefore, when you see var instead of val, you know the writer of that code intentionally made it mutable and weren’t just being lazy by omitting a 6EbR3L.