CODEWITHSUNDEEP
stringparsingrusttype-conversionnumbers
Zullu Balti
Zullu Balti

Reputation: 73

force error when parsing "01" from string to number in rust

I've have a string like this

"32" or "28", "01", "001"

and I want to parse them to a number. However it should not parse a string that starts with 0.

Currently, I'm doing this

let num = str.parse().unwrap_or(-1);

With this implementation it converts "01" to 1 but I want to force -1 when the string stars with 0.

Upvotes: -1

Views: 378

Answers (1)

harmic
harmic

Reputation: 30577

As mentioned in the comments - you could use this:

let num = if s.len() > 1 && s.starts_with('0') {
    -1
} else {
    s.parse().unwrap_or(-1)
};

Upvotes: 1

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