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Add first exercise: Hello world #6
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.DS_Store | ||
bin/configlet | ||
bin/configlet.exe | ||
**/target | ||
exercises/*/*/Scarb.lock |
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{ | ||
"blurb": "ByteArray is a sequence of ASCII characters longer than 31 characters, written using double quotes", | ||
"authors": [ | ||
"misicnenad" | ||
], | ||
"contributors": [] | ||
} |
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# String |
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# Introduction | ||
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In Cairo, there's no native type for strings. Instead, you can use a single `felt252` to store a short string of up to 31 characters, or a `ByteArray` for strings of arbitrary length. Short strings use single quotes and `ByteArray` uses double quotes. All characters must follow the ASCII standard. |
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[ | ||
{ | ||
"url": "https://book.cairo-lang.org/ch02-02-data-types.html#string-types", | ||
"description": "String types in the Cairo book" | ||
}, | ||
{ | ||
"url": "https://starknet-by-example.voyager.online/getting-started/basics/bytearrays-strings.html", | ||
"description": "Starknet by Example section on Strings and ByteArrays" | ||
}, | ||
{ | ||
"url": "https://docs.starknet.io/architecture-and-concepts/smart-contracts/serialization-of-cairo-types/#serialization_of_byte_arrays", | ||
"description": "Starknet docs explaining how ByteArray is implemented and how it's serialized" | ||
} | ||
] |
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# Instructions | ||
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The classical introductory exercise. | ||
Just say "Hello, World!". | ||
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["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment. | ||
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The objectives are simple: | ||
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- Modify the provided code so that it produces the string "Hello, World!". | ||
- Run the test suite and make sure that it succeeds. | ||
- Submit your solution and check it at the website. | ||
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If everything goes well, you will be ready to fetch your first real exercise. | ||
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[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program |
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{ | ||
"authors": [ | ||
"misicnenad" | ||
], | ||
"files": { | ||
"solution": [ | ||
"src/lib.cairo", | ||
"Scarb.toml" | ||
], | ||
"test": [ | ||
"src/tests.cairo" | ||
], | ||
"example": [ | ||
".meta/example.cairo" | ||
] | ||
}, | ||
"blurb": "Exercism's classic introductory exercise. Just say \"Hello, World!\".", | ||
"source": "This is an exercise to introduce users to using Exercism", | ||
"source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program" | ||
} |
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fn hello() -> ByteArray { | ||
"Hello, World!" | ||
} |
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# This is an auto-generated file. | ||
# | ||
# Regenerating this file via `configlet sync` will: | ||
# - Recreate every `description` key/value pair | ||
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications | ||
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion) | ||
# - Preserve any other key/value pair | ||
# | ||
# As user-added comments (using the # character) will be removed when this file | ||
# is regenerated, comments can be added via a `comment` key. | ||
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[af9ffe10-dc13-42d8-a742-e7bdafac449d] | ||
description = "Say Hi!" |
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[package] | ||
name = "hello_world" | ||
version = "0.1.0" | ||
edition = "2023_11" |
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// ByteArray is a string that's not limited to 31 characters, you'll learn more about this later | ||
fn hello() -> ByteArray { | ||
"Goodbye, Mars!" | ||
} | ||
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#[cfg(test)] | ||
mod tests; | ||
Comment on lines
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I don't see this bit in the example implementation. Should that also contain this part? |
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#[test] | ||
fn test_hello_world() { | ||
assert_eq!(hello_world::hello(), "Hello, World!"); | ||
} |
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Just so you know: concepts will only show up for concept exercise. So while you can write them whilst adding practice exercises, feel free to postpone writing them until you want to add concept exercises.