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+---
+language: ReScript
+filename: rescript.res
+contributors:
+  - ["Seth Corker", "https://sethcorker.com"]
+  - ["Danny Yang", "https://yangdanny97.github.io"]
+---
+
+ReScript is a robustly typed language that compiles to efficient and human-readable JavaScript. It comes with a lightning fast compiler toolchain that scales to any codebase size. ReScript is descended from OCaml and Reason, with nice features like type inference and pattern matching, along with beginner-friendly syntax and a focus on the JavaScript ecosystem.
+
+```javascript
+/* Comments start with slash-star, and end with star-slash */
+// Single line comments start with double slash
+
+/*----------------------------------------------
+ * Variable and function declaration
+ *----------------------------------------------
+ * Variables and functions use the let keyword and end with a semi-colon
+ * `let` bindings are immutable
+ */
+
+let x = 5
+/* - Notice we didn't add a type, ReScript will infer x is an int */
+
+/* A function like this, take two arguments and add them together */
+let add = (a, b) => a + b
+/* - This doesn't need a type annotation either! */
+
+/*----------------------------------------------
+ * Type annotation
+ *----------------------------------------------
+ * Types don't need to be explicitly annotated in most cases but when you need
+ * to, you can add the type after the name
+ */
+
+/* A type can be explicitly written like so */
+let x: int = 5
+
+/* The add function from before could be explicitly annotated too */
+let add2 = (a: int, b: int): int => a + b
+
+/* A type can be aliased using the type keyword */
+type companyId = int
+let myId: companyId = 101
+
+/* Mutation is not encouraged in ReScript but it's there if you need it
+   If you need to mutate a let binding, the value must be wrapped in a `ref()`*/
+let myMutableNumber = ref(120)
+
+/* To access the value (and not the ref container), use `.contents` */
+let copyOfMyMutableNumber = myMutableNumber.contents
+
+/* To assign a new value, use the `:=` operator */
+myMutableNumber := 240
+
+/*----------------------------------------------
+ * Basic types and operators
+ *----------------------------------------------
+ */
+
+/* > String */
+
+/* Use double quotes for strings */
+let greeting = "Hello world!"
+
+/* A string can span multiple lines */
+let aLongerGreeting = "Look at me,
+I'm a multi-line string
+"
+
+/* Use ` for unicode */
+let world = `🌍`
+
+/* The ` annotation is also used for string interpolation */
+let helloWorld = `hello, ${world}`
+/* Bindings must be converted to strings */
+let age = 10
+let ageMsg = `I am ${Js.Int.toString(age)} years old`
+
+/* Using `j` annotation in interpolation will implicitly convert bindings to strings */
+let ageMsg = j`I am $age years old`
+
+
+/* Concatenate strings with ++ */
+let name = "John " ++ "Wayne"
+let emailSubject = "Hi " ++ name ++ ", you're a valued customer"
+
+/* > Char */
+
+/* Use a single character for the char type */
+let lastLetter = 'z'
+/* - Char doesn't support Unicode or UTF-8 */
+
+/* > Boolean */
+
+/* A boolean can be either true or false */
+let isLearning = true
+
+true && false  /* - : bool = false  Logical and */
+true || true   /* - : bool = true   Logical or  */
+!true          /* - : bool = false  Logical not */
+
+/* Greater than `>`, or greater than or equal to `>=` */
+'a' > 'b' /* - bool : false */
+
+/* Less than `<`, or less than or equal to `<=` */
+1 < 5 /* - : bool = true */
+
+/* Structural equal */
+"hello" == "hello" /* - : bool = true */
+
+/* Referential equal */
+"hello" === "hello" /* - : bool = false */
+/* - This is false because they are two different "hello" string literals */
+
+/* Structural unequal */
+lastLetter != 'a' /* -: bool = true */
+
+/* Referential unequal */
+lastLetter !== lastLetter /* - : bool = false */
+
+/* > Integer */
+/* Perform math operations on integers */
+
+1 + 1          /* - : int = 2  */
+25 - 11        /* - : int = 11 */
+5 * 2 * 3      /* - : int = 30 */
+8 / 2          /* - : int = 4  */
+
+/* > Float */
+/* Operators on floats have a dot after them */
+
+1.1 +. 1.5     /* - : float = 2.6  */
+18.0 -. 24.5   /* - : float = -6.5 */
+2.5 *. 2.0     /* - : float = 5.   */
+16.0 /. 4.0    /* - : float = 4.   */
+
+/* > Tuple
+ * Tuples have the following attributes
+  - immutable
+  - ordered
+  - fix-sized at creation time
+  - heterogeneous (can contain different types of values)
+ A tuple is 2 or more values */
+
+let teamMember = ("John", 25)
+
+/* Type annotation matches the values */
+let position2d: (float, float) = (9.0, 12.0)
+
+/* Pattern matching is a great tool to retrieve just the values you care about
+   If we only want the y value, let's use `_` to ignore the value */
+let (_, y) = position2d
+y +. 1.0 /* - : float = 13. */
+
+/* > Record */
+
+/* A record has to have an explicit type */
+type trainJourney = {
+  destination: string,
+  capacity: int,
+  averageSpeed: float,
+}
+
+/* Once the type is declared, ReScript can infer it whenever it comes up */
+let firstTrip = {destination: "London", capacity: 45, averageSpeed: 120.0}
+
+/* Access a property using dot notation */
+let maxPassengers = firstTrip.capacity
+
+/* If you define the record type in a different file, you have to reference the
+   filename, if trainJourney was in a file called Trips.re */
+let secondTrip: Trips.trainJourney = {
+  destination: "Paris",
+  capacity: 50,
+  averageSpeed: 150.0,
+}
+
+/* Records are immutable by default */
+/* But the contents of a record can be copied using the spread operator */
+let newTrip = {...secondTrip, averageSpeed: 120.0}
+
+/* A record property can be mutated explicitly with the `mutable` keyword */
+type breakfastCereal = {
+  name: string,
+  mutable amount: int,
+}
+
+let tastyMuesli = {name: "Tasty Muesli TM", amount: 500}
+
+tastyMuesli.amount = 200
+/* - tastyMuesli now has an amount of 200 */
+
+/* Punning is used to avoid redundant typing */
+let name = "Just As Good Muesli"
+let justAsGoodMuesli = {name, amount: 500}
+/* - justAsGoodMuesli.name is now "Just As Good Muesli", it's equivalent
+   to { name: name, amount: 500 } */
+
+/* > Variant
+   Mutually exclusive states can be expressed with variants */
+
+type authType =
+  | GitHub
+  | Facebook
+  | Google
+  | Password
+/* - The constructors must be capitalized like so */
+/* - Like records, variants should be named if declared in a different file */
+
+let userPreferredAuth = GitHub
+
+/* Variants work great with a switch statement */
+let loginMessage =
+  switch (userPreferredAuth) {
+  | GitHub => "Login with GitHub credentials."
+  | Facebook => "Login with your Facebook account."
+  | Google => "Login with your Google account"
+  | Password => "Login with email and password."
+  }
+
+/* > Option
+   An option can be None or Some('a) where 'a is the type */
+
+let userId = Some(23)
+
+/* A switch handles the two cases */
+let alertMessage =
+  switch (userId) {
+  | Some(id) => "Welcome, your ID is" ++ string_of_int(id)
+  | None => "You don't have an account!"
+  }
+/* - Missing a case, `None` or `Some`, would cause an error */
+
+/* > List
+  * Lists have the following attributes
+   - immutable
+   - ordered
+   - fast at prepending items
+   - fast at splitting
+
+  * Lists in ReScript are linked lists
+ */
+
+/* A list is declared with the `list` keyword and initialized with values wrapped in curly braces */
+let userIds = list{1, 4, 8}
+
+/* The type can be explicitly set with list<'a> where 'a is the type */
+type idList = list<int>
+type attendanceList = list<string>
+
+/* Lists are immutable */
+/* But you can create a new list with additional prepended elements by using the spread operator on an existing list */
+let newUserIds = list{101, 102, ...userIds}
+
+/* > Array
+ * Arrays have the following attributes
+  - mutable
+  - fast at random access & updates */
+
+/* An array is declared with `[` and ends with `]` */
+let languages = ["ReScript", "JavaScript", "OCaml"]
+
+/*----------------------------------------------
+ * Function
+ *----------------------------------------------
+ */
+
+/* ReScript functions use the arrow syntax, the expression is returned */
+let signUpToNewsletter = email => "Thanks for signing up " ++ email
+
+/* Call a function like this */
+signUpToNewsletter("hello@ReScript.org")
+
+/* For longer functions, use a block */
+let getEmailPrefs = email => {
+  let message = "Update settings for " ++ email
+  let prefs = ["Weekly News", "Daily Notifications"]
+
+  (message, prefs)
+}
+/* - the final tuple is implicitly returned */
+
+/* > Labeled Arguments */
+
+/* Arguments can be labeled with the ~ symbol */
+let moveTo = (~x, ~y) => {
+  /* Move to x,y */
+  ()
+}
+
+moveTo(~x=7.0, ~y=3.5)
+
+/* Labeled arguments can also have a name used within the function */
+let getMessage = (~message as msg) => "==" ++ msg ++ "=="
+
+getMessage(~message="You have a message!")
+/* - The caller specifies ~message but internally the function can make use */
+
+/* The following function also has explicit types declared */
+let showDialog = (~message: string): unit => {
+  () /* Show the dialog */
+}
+/* - The return type is `unit`, this is a special type that is equivalent to
+   specifying that this function doesn't return a value
+   the `unit` type can also be represented as `()` */
+
+/* > Currying
+   Functions can be curried and are partially called, allowing for easy reuse */
+
+let div = (denom, numr) => numr / denom
+let divBySix = div(6)
+let divByTwo = div(2)
+
+div(3, 24)     /* - : int = 8  */
+divBySix(128)  /* - : int = 21 */
+divByTwo(10)   /* - : int = 5  */
+
+/* > Optional Labeled Arguments */
+
+/* Use `=?` syntax for optional labeled arguments */
+let greetPerson = (~name, ~greeting=?, ()) => {
+  switch (greeting) {
+  | Some(greet) => greet ++ " " ++ name
+  | None => "Hi " ++ name
+  }
+}
+/* - The third argument, `unit` or `()` is required because if we omitted it,
+   the function would be curried so greetPerson(~name="Kate") would create
+   a partial function, to fix this we add `unit` when we declare and call it */
+
+/* Call greetPerson without the optional labeled argument */
+greetPerson(~name="Kate", ())
+
+/* Call greetPerson with all arguments */
+greetPerson(~name="Marco", ~greeting="How are you today,")
+
+/* > Pipe */
+/* Functions can be called with the pipeline operator */
+
+/* Use `->` to pass in the first argument (pipe-first) */
+3->div(24)     /* - : int = 8 */
+/* - This is equivalent to div(3, 24) */
+
+36->divBySix   /* - : int = 6 */
+/* - This is equivalent to divBySix(36) */
+
+/* Pipes make it easier to chain code together */
+let addOne = a => a + 1
+let divByTwo = a => a / 2
+let multByThree = a => a * 3
+
+let pipedValue = 3->addOne->divByTwo->multByThree /* - : int = 6 */
+
+/*----------------------------------------------
+ * Control Flow & Pattern Matching
+ *----------------------------------------------
+ */
+
+/* > If-else */
+/* In ReScript, `If` is an expression when evaluate will return the result */
+
+/* greeting will be "Good morning!" */
+let greeting = if (true) {"Good morning!"} else {"Hello!"}
+
+/* Without an else branch the expression will return `unit` or `()` */
+if (false) {
+  showDialog(~message="Are you sure you want to leave?")
+}
+/* - Because the result will be of type `unit`, both return types should be of
+   the same type if you want to assign the result. */
+
+/* > Destructuring */
+/* Extract properties from data structures easily */
+
+let aTuple = ("Teacher", 101)
+
+/* We can extract the values of a tuple */
+let (name, classNum) = aTuple
+
+/* The properties of a record can be extracted too */
+type person = {
+  firstName: string,
+  age: int,
+}
+let bjorn = {firstName: "Bjorn", age: 28}
+
+/* The variable names have to match with the record property names */
+let {firstName, age} = bjorn
+
+/* But we can rename them like so */
+let {firstName: bName, age: bAge} = bjorn
+
+let {firstName: cName, age: _} = bjorn
+
+/* > Switch
+   Pattern matching with switches is an important tool in ReScript
+   It can be used in combination with destructuring for an expressive and
+   concise tool */
+
+/* Lets take a simple list */
+let firstNames = ["James", "Jean", "Geoff"]
+
+/* We can pattern match on the names for each case we want to handle */
+switch (firstNames) {
+| [] => "No names"
+| [first] => "Only " ++ first
+| [first, second] => "A couple of names " ++ first ++ "," ++ second
+| [first, second, third] =>
+  "Three names, " ++ first ++ ", " ++ second ++ ", " ++ third
+| _ => "Lots of names"
+}
+/* - The `_` is a catch all at the end, it signifies that we don't care what
+   the value is so it will match every other case */
+
+/* > When clause */
+
+let isJohn = a => a == "John"
+let maybeName = Some("John")
+
+/* When can add more complex logic to a simple switch */
+let aGreeting =
+  switch (maybeName) {
+  | Some(name) when isJohn(name) => "Hi John! How's it going?"
+  | Some(name) => "Hi " ++ name ++ ", welcome."
+  | None => "No one to greet."
+  }
+
+/* > Exception */
+
+/* Define a custom exception */
+exception Under_Age
+
+/* Raise an exception within a function */
+let driveToTown = (driver: person) =>
+  if (driver.age >= 15) {
+    "We're in town"
+  } else {
+    raise(Under_Age)
+  }
+
+let evan = {firstName: "Evan", age: 14}
+
+/* Pattern match on the exception Under_Age */
+switch (driveToTown(evan)) {
+| status => print_endline(status)
+| exception Under_Age =>
+  print_endline(evan.firstName ++ " is too young to drive!")
+}
+
+/* Alternatively, a try block can be used */
+/* - With ReScript exceptions can be avoided with optionals and are seldom used */
+let messageToEvan =
+  try {
+    driveToTown(evan)
+  } catch {
+  | Under_Age => evan.firstName ++ " is too young to drive!"
+  }
+
+/*----------------------------------------------
+ * Object
+ *----------------------------------------------
+ * Objects are similar to Record types, but are less rigid
+ */
+
+/* An object may be typed like a record but the property names are quoted */
+type surfaceComputer = {
+  "color": string,
+  "capacity": int,
+}
+let surfaceBook: surfaceComputer = { "color": "blue", "capacity": 512 }
+
+/* Objects don't require types */
+let hamster = { "color": "brown", "age": 2 }
+
+/* Object typing is structural, so you can have functions that accept any object with the required fields */
+let getAge = animal => animal["age"]
+getAge(hamster)
+getAge({ "name": "Fido", "color": "silver", "age": 3 })
+getAge({ "age": 5 })
+
+/*----------------------------------------------
+ * Module
+ *----------------------------------------------
+ * Modules are used to organize your code and provide namespacing.
+ * Each file is a module by default
+ */
+
+/* Create a module */
+module Staff = {
+  type role =
+    | Delivery
+    | Sales
+    | Other
+  type member = {
+    name: string,
+    role,
+  }
+
+  let getRoleDirectionMessage = staff =>
+    switch (staff.role) {
+    | Delivery => "Deliver it like you mean it!"
+    | Sales => "Sell it like only you can!"
+    | Other => "You're an important part of the team!"
+    }
+}
+
+/* A module can be accessed with dot notation */
+let newEmployee: Staff.member = {name: "Laura", role: Staff.Delivery}
+
+/* Using the module name can be tiresome so the module's contents can be opened
+   into the current scope with `open` */
+open Staff
+
+let otherNewEmployee: member = {name: "Fred", role: Other}
+
+/* A module can be extended using the `include` keyword, include copies
+   the contents of the module into the scope of the new module */
+module SpecializedStaff = {
+  include Staff
+
+  /* `member` is included so there's no need to reference it explicitly */
+  let ceo: member = {name: "Reggie", role: Other}
+
+  let getMeetingTime = staff =>
+    switch (staff) {
+    | Other => 11_15 /* - : int = 1115 Underscores are for formatting only  */
+    | _ => 9_30
+    }
+}
+```
+
+## Further Reading
+
+- [Official ReScript Docs](https://rescript-lang.org/)
+- [Try ReScript - Online Playground](https://rescript-lang.org/try)