103 lines
1.8 KiB
Markdown
103 lines
1.8 KiB
Markdown
---
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id: string-reference
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title: String — Manipulate string data
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---
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import Syntax from '@theme/Syntax';
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## String.size(s: string) : nat
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Get the size of a string. [Michelson only supports ASCII strings](http://tezos.gitlab.io/whitedoc/michelson.html#constants)
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so for now you can assume that each character takes one byte of storage.
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<Syntax syntax="pascaligo">
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```pascaligo
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function string_size (const s: string) : nat is size(s)
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```
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</Syntax>
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<Syntax syntax="cameligo">
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```cameligo
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let size_op (s: string) : nat = String.size s
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```
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</Syntax>
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<Syntax syntax="reasonligo">
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```reasonligo
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let size_op = (s: string): nat => String.size(s);
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```
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</Syntax>
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## String.length(s: string) : nat
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Alias for `String.size`.
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## String.slice(pos1: nat, pos2: nat, s: string) : string
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Get the substring of `s` between `pos1` inclusive and `pos2` inclusive. For example
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the string "tata" given to the function below would return "at".
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<Syntax syntax="pascaligo">
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```pascaligo
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function slice_op (const s : string) : string is string_slice(1n , 2n , s)
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```
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</Syntax>
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<Syntax syntax="cameligo">
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```cameligo
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let slice_op (s: string) : string = String.slice 1n 2n s
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```
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</Syntax>
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<Syntax syntax="reasonligo">
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```reasonligo
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let slice_op = (s: string): string => String.slice(1n, 2n, s);
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```
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</Syntax>
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## String.sub(pos1: nat, pos2: nat, s: string) : string
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Alias for `String.slice`.
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## String.concat(s1: string, s2: string) : string
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Concatenate two strings and return the result.
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<Syntax syntax="pascaligo">
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```pascaligo
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function concat_op (const s : string) : string is s ^ "toto"
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```
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</Syntax>
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<Syntax syntax="cameligo">
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```cameligo
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let concat_syntax (s: string) = s ^ "test_literal"
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```
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</Syntax>
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<Syntax syntax="reasonligo">
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```reasonligo
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let concat_syntax = (s: string) => s ++ "test_literal";
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```
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</Syntax>
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