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ID: go-best-practices/inefficient-string-comparison
Language: Go
Severity: Info
Category: Best Practices
In Go, it is recommended not to use strings.ToLower(s1) == strings.ToLower(s2)
for case-insensitive string comparison. Instead, the strings.EqualFold(s1, s2)
function should be used. Here’s why:
strings.EqualFold(s1, s2)
is more efficient because it avoids unnecessary string allocations. When you use strings.ToLower(s1)
, it creates a new lowercase string each time it is called. Comparing two lowercase strings using ==
(equality operator) then requires additional string comparison operations. In contrast, strings.EqualFold(s1, s2)
performs a case-insensitive comparison directly without creating additional strings.strings.EqualFold(s1, s2)
is specifically designed for case-insensitive string comparison. It takes into account different languages and ensures accurate results even with non-ASCII characters or special Unicode cases. In contrast, using strings.ToLower
might not handle all edge cases correctly or consistently.strings.EqualFold(s1, s2)
, you convey your intention clearly and improve the readability of your code. The function’s name indicates that it performs a case-insensitive comparison, making the code easier to understand for future developers or maintainers.Therefore, it is recommended to use strings.EqualFold(s1, s2)
for case-insensitive string comparison in Go. This approach provides better performance, accuracy, and code clarity.
func main() {
if strings.ToLower(s1) != strings.ToLower(s2) {
//
}
if !strings.EqualFold(s1, s2) {
//
}
}
func main() {
if strings.ToLower(s1) == strings.ToLower(s2) {
//
}
}
func main() {
if strings.EqualFold(s1, s2) {
//
}
}