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 ≔ … Read more
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 … Read more
This now works in v1.8.3 on R-Forge. Thanks for highlighting it! x <- data.table(a = 1:3, b = 1:6) f <- function(x) {list(“hi”, “hello”)} x[ , c(“col1”, “col2”) := f(), by = a][] # a b col1 col2 # 1: 1 1 hi hello # 2: 2 2 hi hello # 3: 3 3 hi … Read more
Updated answer In the context of the question, we are dealing with pseudocode, but starting in Python 3.8, := is actually a valid operator that allows for assignment of variables within expressions: # Handle a matched regex if (match := pattern.search(data)) is not None: # Do something with match # A loop that can’t be … Read more