I am unsure of the specific distinctions.
I am curious about the variations.
I am unsure of the specific distinctions.
I am curious about the variations.
As per the information available at
,
the {||} syntax in Flow is used to ensure "exact" object types, which means that no additional properties beyond what is specified will be permitted.
An example from the documentation demonstrates this concept:
// @flow
var foo: {| foo: string |} = { foo: "Hello", bar: "World!" }; // Error!
This code snippet fails because the object assigned to variable foo can only contain a property named foo, but it includes an unauthorized property named bar.
However, if you remove the exact syntax and instead define foo as shown below, the code will work:
var foo: { foo: string } = { foo: "Hello", bar: "World!" }; // Work
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