rustHow to format strings and truncate long ones in Rust

Formatting strings and truncating long ones in Rust can be done using the format! macro. This macro allows you to specify a format string and a list of arguments to be formatted according to the format string. The format string can contain placeholders for the arguments, which will be replaced with the corresponding argument values. Additionally, the format! macro can be used to truncate long strings by specifying a maximum length for the output string.

Below is an example of using the format! macro to format and truncate a string:

let long_string = "This is a very long string that needs to be truncated";
let truncated_string = format!("{:.10}", long_string);

println!("{}", truncated_string);

Output

This is a

In the above example, the format! macro is used to format the long_string variable. The {:.10} part of the format string specifies that the output string should be truncated to a maximum length of 10 characters. The resulting truncated string is then printed using the println! macro.

Explanation of code parts:

• let long_string = "This is a very long string that needs to be truncated";: This line declares a variable called long_string and assigns it a string value.
• let truncated_string = format!("{:.10}", long_string);: This line uses the format! macro to format the long_string variable. The {:.10} part of the format string specifies that the output string should be truncated to a maximum length of 10 characters.
• println!("{}", truncated_string);: This line prints the truncated string using the println! macro.

Helpful links:

• Rust Documentation - format!
• Rust Documentation - println!

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