Function: className()

className(value): string

Converts a heterogeneous class value to a normalized space-separated class string.

Handles strings, nested arrays (recursively flattened), any iterable (e.g. Set), and dictionary objects where only keys with truthy values are included. Falsy primitives, true/false, null and undefined produce an empty string.

Parameters

value

any

The class value to normalize. May be a string, array, iterable, dictionary (Record<string, boolean>), primitive, or nested combination thereof.

Returns

string

A space-separated class name string, or "" when the input yields no classes.

Example

className("foo bar") // => "foo bar"
className(["foo", ["bar", { baz: true, qux: false }]]) // => "foo bar baz"
className(new Set(["a", "b"])) // => "a b"