In Go, top-level variable assignments must be prefixed with the var keyword. Omitting the var keyword is only allowed within blocks. package main var toplevel = “Hello world” // var keyword is required func F() { withinBlock := “Hello world” // var keyword is not required }
In PL/PgSQL parser, assignment operator is defined as assign_operator : ‘=’ | COLON_EQUALS ; This is a legacy feature, present in source code since 1998, when it was introduced – as we can see in the PostgreSQL Git repo. Starting from version 9.4 it is oficially documented. This idiosyncrasy – of having two operators for …
= in scala is the actual assignment operator — it does a handful of specific things that for the most part you don’t have control over, such as Giving a val or var a value when it’s created Changing the value of a var Changing the value of a field on a class Making a …
= is assignment. more about assignment in Go: Assignments The subtle difference between = and := is when = used in variable declarations. General form of variable declaration in Go is: var name type = expression the above declaration creates a variable of a particular type, attaches a name to it, and sets its initial …
Variables defined with := in GNU make are expanded when they are defined rather than when they are used.
Here is an example showing 10 minutes reduced to 1 second (from NEWS on homepage). It’s like subassigning to a data.frame but doesn’t copy the entire table each time. m = matrix(1,nrow=100000,ncol=100) DF = as.data.frame(m) DT = as.data.table(m) system.time(for (i in 1:1000) DF[i,1] <- i) user system elapsed 287.062 302.627 591.984 system.time(for (i in 1:1000) …
Remove the colon : from the second statement as you are assigning a new value to existing variable. myArray = […]int{11,12,14} colon : is used when you perform the short declaration and assignment for the first time as you are doing in your first statement i.e. myArray :=[…]int{12,14,26}.
http://en.wikipedia.org/wiki/Equals_sign#In_computer_programming In computer programming languages, the equals sign typically denotes either a boolean operator to test equality of values (e.g. as in Pascal or Eiffel), which is consistent with the symbol’s usage in mathematics, or an assignment operator (e.g. as in C-like languages). Languages making the former choice often use a colon-equals (:=) or ≔ …
Simple assignment := A simple assignment expression is evaluated only once, at the very first occurrence. For example, if CC :=${GCC} ${FLAGS} during the first encounter is evaluated to gcc -W then each time ${CC} occurs it will be replaced with gcc -W. Recursive assignment = A Recursive assignment expression is evaluated everytime the variable …