Syntax Lookup

Enter some language construct you want to know more about.

This is the ref value assignment operator.

This operator assigns a new value to a ref.

ReScriptJS Output

let total = ref(0)
total := 1

A ref is a builtin record type with a mutable contents field. Therefore the := operator is just a shorthand version for the following code:

ReScriptJS Output

let total = ref(0)
total.contents = 1