Use short variable declarations (:=) for variables with default values

Why you should care

Short variable declarations (:=) should be used if a variable is being set to some value explicitly.

How we detect

CAST Highlight counts one occurrence each time a local variable (:= operator is not allowed for global variables) is declared with var statement and is initialized with a default value.

Note : do not consider variables declared with const.


// bad
var s = "foo"
// good
s := "foo"
const (
	idIP0   = 4 // ip address start index
	idDmLen = 4 // domain address length index
const toto := 3



About CAST and Highlight’s Code Insights

Over the last 25 years, CAST has leveraged unique knowledge on software quality measurement by analyzing thousands of applications and billions of lines of code. Based on this experience and community standards on programming best practices, Highlight implements hundreds of code insights across 15+ technologies to calculate health factors of a software.