Parser Capstone

CSV Number Parser

Sum Valid Fields

Parsing often combines splitting, trimming, and conversion while ignoring fields that do not match the target type.

Program

Play the program to choose a CSV line and sum the numeric fields.

csv_number_parser.rs 
fn main() {
    let line = ;
    let total = parse_numbers(line);
    println!("total={total}");
}

fn parse_numbers(line: &str) -> i32 {
    line.split(',')
        .filter_map(|part| part.trim().parse::<i32>().ok())
        .sum()
}

fn main() {
    let line = ;
    let total = parse_numbers(line);
    println!("total={total}");
}

fn parse_numbers(line: &str) -> i32 {
    line.split(',')
        .filter_map(|part| part.trim().parse::<i32>().ok())
        .sum()
}

fn main() {
    let line = ;
    let total = parse_numbers(line);
    println!("total={total}");
}

fn parse_numbers(line: &str) -> i32 {
    line.split(',')
        .filter_map(|part| part.trim().parse::<i32>().ok())
        .sum()
}
split `split(',')` creates fields from a comma-separated line.
filter_map `filter_map` keeps successfully parsed numbers and skips invalid fields.
sum `sum` folds the parsed numbers into one total.