127 lines
3.3 KiB
Markdown
127 lines
3.3 KiB
Markdown
# High School Sweetheart
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Welcome to High School Sweetheart on Exercism's Gleam Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
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## Introduction
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## Pipe Operator
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The `|>` operator is called the pipe operator. It can be used to chain function calls together in such a way that the value returned by the previous function call is passed to the next function call.
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```gleam
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"hello"
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|> string.uppercase
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|> string.append("?!")
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// -> "HELLO?!"
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```
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The above code is equivalent to the following:
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```gleam
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string.append(string.uppercase("hello"), "?!")
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```
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The pipe operator will either pass the value as the first argument to the function call, or the only argument to a new call, selecting whichever would have the correct type.
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```gleam
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100
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|> function_that_takes_two_arguments(1)
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// Is equivalent to
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function_that_takes_two_arguments(100, 1)
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```
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```gleam
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100
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|> function_that_returns_a_function(1)
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// Is equivalent to
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function_that_returns_a_function(1)(100)
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```
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Sometimes we want to pass the value into another position, in this case the `_` placeholder can be used to indicate where the value should be inserted.
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```gleam
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100
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|> some_function(1, _, 2)
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```
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## Instructions
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In this exercise, you are going to help high school sweethearts profess their love on social media by generating an ASCII heart with their initials:
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```
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****** ******
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** ** ** **
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** ** ** **
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** * **
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** **
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** J. K. + M. B. **
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** **
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** **
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** **
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** **
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** **
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** **
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***
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*
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```
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## 1. Get the name's first letter
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Implement the `first_letter` function. It should take a name and return its first letter. It should clean up any unnecessary whitespace from the name.
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```gleam
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first_letter("Jane")
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// -> "J"
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```
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## 2. Format the first letter as an initial
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Implement the `initial` function. It should take a name and return its first letter, uppercase, followed by a dot. Make sure to reuse `first_letter` that you defined in the previous step.
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```gleam
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initial("Robert")
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// -> "R."
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```
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## 3. Split the full name into the first name and the last name
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Implement the `initials` function. It should take a full name, consisting of a first name and a last name separated by a space, and return the initials. Make sure to reuse `initial` that you defined in the previous step.
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```gleam
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initials("Lance Green")
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// -> "L. G."
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```
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## 4. Put the initials inside of the heart
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Implement the `pair` function. It should take two full names and return the initials inside an ASCII heart. Make sure to reuse `initials` that you defined in the previous step.
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```gleam
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pair("Blake Miller", "Riley Lewis")
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// -> "
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// ****** ******
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// ** ** ** **
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// ** ** ** **
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// ** * **
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// ** **
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// ** B. M. + R. L. **
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// ** **
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// ** **
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// ** **
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// ** **
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// ** **
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// ** **
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// ***
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// *
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// "
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```
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## Source
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### Created by
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- @lpil |