History of Idiom 22 > diff from v21 to v22

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Version 21

2015-10-25, 19:06:50

Version 22

2015-10-29, 14:05:12

Idiom #22 Convert string to integer

Extract integer value i from its string representation s (in radix 10)

Idiom #22 Convert string to integer

Extract integer value i from its string representation s (in radix 10)

Rust

Rust

Code

let i: i32 = s.parse().unwrap_or(0);

Code

let i: i32 = s.parse().unwrap_or(0);

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This explicitly sets the value to 0 if it can't be parsed to an integer.

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This explicitly sets the value to 0 if it can't be parsed to an integer.

Demo URL

https://play.rust-lang.org/?code=fn%20main()%20%7B%0A%20%20%20%20let%20s%20%3D%20%2242%22%3B%0A%20%20%20%20let%20i%3A%20i32%20%3D%20s.parse().unwrap_or(0)%3B%0A%20%20%20%20%0A%20%20%20%20println!(%22%7B%7D%22%2C%20i)%3B%0A%7D%0A&version=stable

Demo URL

Imports

import std.conv;

Imports

import std.conv;

Code

auto i = s.to!int;

Code

auto i = s.to!int;

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the extremely useful 'to' function can convert just about anything to something else. It will throw on a non-integral input string.

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the extremely useful 'to' function can convert just about anything to something else. It will throw on a non-integral input string.

Perl

Perl

Code

print "Perl automatically converts numbers, like ", 7, "to strings when needed\n";

my $s = "12";
my $i = $s + 13;   # Foo is now 25

Code

print "Perl automatically converts numbers, like ", 7, "to strings when needed\n";

my $s = "12";
my $i = $s + 13;   # Foo is now 25

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Perl automatically converts numbers to strings and strings to numbers whenever required.

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Perl automatically converts numbers to strings and strings to numbers whenever required.

Imports

import "strconv"

Imports

import "strconv"

Code

i, err  := strconv.ParseInt(s, 10, 0)

Code

i, err  := strconv.ParseInt(s, 10, 0)

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Radix 10. Third argument 0 means "fit in implementation-specific int". But result type is always int64.
Don't ignore the potential error err !

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Radix 10. Third argument 0 means "fit in implementation-specific int". But result type is always int64.
Don't ignore the potential error err !

Doc URL

http://golang.org/pkg/strconv/#ParseInt

Doc URL

http://golang.org/pkg/strconv/#ParseInt

Imports

#include <stdlib.h>

Imports

#include <stdlib.h>

Code

int i = atoi(s);

Code

int i = atoi(s);

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s is a char*

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s is a char*

Imports

import "strconv"

Imports

import "strconv"

Code

i, err  := strconv.Atoi(s)

Code

i, err  := strconv.Atoi(s)

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Atoi(s) is shorthand for ParseInt(s, 10, 0). It yields type int.

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Atoi(s) is shorthand for ParseInt(s, 10, 0). It yields type int.

Doc URL

http://golang.org/pkg/strconv/#Atoi

Doc URL

http://golang.org/pkg/strconv/#Atoi

Demo URL

http://play.golang.org/p/VXjGHZbj6J

Demo URL

http://play.golang.org/p/VXjGHZbj6J

Ruby

Ruby

Code

i = s.to_i

Code

i = s.to_i

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"123".to_i returns 123
"abc".to_i returns 0

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"123".to_i returns 123
"abc".to_i returns 0

Java

Java

Code

int i = Integer.parseInt( s );

Code

int i = Integer.parseInt( s );

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This will throw NumberFormatException if s does not contain a parsable integer

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This will throw NumberFormatException if s does not contain a parsable integer

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History of Idiom 22 > diff from v21 to v22

Version 21

Version 22

Idiom #22 Convert string to integer

Idiom #22 Convert string to integer

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