Core

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

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

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 2 seconds (2000 milliseconds).
let intervalId = setInterval(() => {
  Console.log("This prints every 2 seconds.")
}, 2000)

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 (2000 milliseconds).
let intervalId = setIntervalFloat(() => {
  Console.log("This prints every 2 seconds.")
}, 2000.)

clearInterval(intervalId) clears a scheduled interval.

See clearInterval on MDN.

Examples

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

// Stop the interval after 10 seconds
let timeoutId = setTimeout(() => {
  clearInterval(intervalId)
}, 10000)

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

Core__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 Core__Array.res

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

Compiles to:

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