How Can I Efficiently Remove the Newline Character from a String Read in Go?

Efficient Substring Extraction in Go

When handling input from the console, it's common to read entire lines for further processing. However, the newline character can present a challenge using bufio.ReadString(). To address this, some have suggested manually trimming the newline character.

input, _ := src.ReadString('\n')
inputFmt := input[0:len(input) - 2] + "" // Manual newline trimming

Is there a more elegant solution?

To answer this question, we need to clarify two key concepts in Go:

• Slices: Unlike C-style arrays, Go slices inherently store their length in bytes. Therefore, you don't need to explicitly calculate the length before slicing.
• String Storage: Go strings are not null-terminated, so there is no need to remove a null byte when extracting substrings.

With these concepts in mind, the following approach provides a more idiomatic and efficient solution:

input, _ := src.ReadString('\n')
inputFmt := input[:len(input) - 1]

This version simply slices the input string up to the last character (assuming it's a one-byte character). This avoids unnecessary string manipulation and ensures efficient substring extraction.

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