Stdlib

An id representing a timeout started via setTimeout.

See setTimeout on MDN.

setTimeout(callback, durationInMilliseconds) starts a timer that will execute callback after durationInMilliseconds.

See setTimeout on MDN.

Examples

RESCRIPT
// Log to the console after 200 milliseconds.
let timeoutId = setTimeout(() => {
  Console.log("This prints in 200 ms.")
}, 200)

setTimeoutFloat(callback, durationInMilliseconds) starts a timer that will execute callback after durationInMilliseconds.

The same as setTimeout, but allows you to pass a float instead of an int for the duration.

See setTimeout on MDN.

Examples

RESCRIPT
// Log to the console after 200 milliseconds.
let timeoutId = setTimeoutFloat(() => {
  Console.log("This prints in 200 ms.")
}, 200.)

clearTimeout(timeoutId) clears a scheduled timeout if it hasn't already executed.

See clearTimeout on MDN.

Examples

RESCRIPT
let timeoutId = setTimeout(() => {
  Console.log("This prints in 2 seconds.")
}, 2000)

// Clearing the timeout right away, before 2 seconds has passed, means that the above callback logging to the console will never run.
clearTimeout(timeoutId)

An id representing an interval started via setInterval.

See setInterval on MDN.

setInterval(callback, intervalInMilliseconds) starts an interval that will execute callback every durationInMilliseconds milliseconds.

See setInterval on MDN.

Examples

RESCRIPT
// Log to the console ever 200 ms (200 milliseconds).
let intervalId = setInterval(() => {
  Console.log("This prints every 200 ms.")
}, 200)

let timeoutId = setTimeout(() => {
  clearInterval(intervalId)
}, 500)

setIntervalFloat(callback, intervalInMilliseconds) starts an interval that will execute callback every durationInMilliseconds milliseconds.

The same as setInterval, but allows you to pass a float instead of an int for the duration.

See setInterval on MDN.

Examples

RESCRIPT
// Log to the console ever 2 seconds (200 milliseconds).
let intervalId = setIntervalFloat(() => {
  Console.log("This prints every 200 ms")
}, 200.)

// Stop the interval after 500 ms
let timeoutId = setTimeoutFloat(() => {
  clearInterval(intervalId)
}, 500.0)

clearInterval(intervalId) clears a scheduled interval.

See clearInterval on MDN.

Examples

RESCRIPT
let intervalId = setInterval(() => {
  Console.log("This prints in 100 ms")
}, 100)

// Stop the interval after 500 ms
let timeoutId = setTimeout(() => {
  clearInterval(intervalId)
}, 500)

Encodes a URI by replacing characters in the provided string that aren't valid in a URL.

This is intended to operate on full URIs, so it encodes fewer characters than what encodeURIComponent does. If you're looking to encode just parts of a URI, like a query parameter, prefer encodeURIComponent.

See encodeURI on MDN.

Examples

RESCRIPT
Console.log(encodeURI("https://rescript-lang.org?array=[someValue]"))
// Logs "https://rescript-lang.org?array=%5BsomeValue%5D" to the console.

Decodes a previously encoded URI back to a regular string.

This is intended to operate on full URIs, so it decodes fewer characters than what decodeURIComponent does. If you're looking to decode just parts of a URI, like a query parameter, prefer decodeURIComponent.

See decodeURI on MDN.

Examples

RESCRIPT
Console.log(decodeURI("https://rescript-lang.org?array=%5BsomeValue%5D"))
// Logs "https://rescript-lang.org?array=[someValue]" to the console.

Encodes a string so it can be used as part of a URI.

See encodeURIComponent on MDN.

Examples

RESCRIPT
Console.log(encodeURIComponent("array=[someValue]"))
// Logs "array%3D%5BsomeValue%5D" to the console.

Decodes a previously URI encoded string back to its original form.

See decodeURIComponent on MDN.

Examples

RESCRIPT
Console.log(decodeURIComponent("array%3D%5BsomeValue%5D"))
// Logs "array=[someValue]" to the console.

import(value) dynamically import a value or function from a ReScript module. The import call will return a promise, resolving to the dynamically loaded value.

Examples

Array.res file:

RESCRIPT
@send external indexOf: (array<'a>, 'a) => int = "indexOf"

let indexOfOpt = (arr, item) =>
  switch arr->indexOf(item) {
  | -1 => None
  | index => Some(index)
  }

In other file you can import the indexOfOpt value defined in Array.res

RESCRIPT
let main = async () => {
  let indexOfOpt = await import(Array.indexOfOpt)
  let index = indexOfOpt([1, 2], 2)
  Console.log(index)
}

Compiles to:

JAVASCRIPT
async function main() {
  var add = await import("./Array.mjs").then(function(m) {
    return m.indexOfOpt;
  });
  var index = indexOfOpt([1, 2], 2);
  console.log(index);
}

assertEqual(a, b) check if a is equal b. If not throw a panic exception

Examples

RESCRIPT
list{1, 2}->List.tailExn == list{2}