ReasonML Quick Start Guide

make

The make function is used to create a populated list. It accepts an integer for the length of the list and a value for each item in the list. Its type is as follows:

(int, 'a) => Belt.List.t('a)

Belt.List.t is exposed as an alias of the list type, so we can say the type of Belt.List.make is as follows:

(int, 'a) => list('a)

We can use it to create a list containing ten strings, like so:

let list = Belt.List.make(10, "string");

In Chapter 5, Effective ML, we will learn about how to explicitly expose or hide types and bindings from a module.