Function mapToArray

Converts Map to Array with a provided transformer function. Useful for plucking out certain properties from contained values and for creating a new map based on transformed values from an input map.

Example: Get an array of ages from a map of Person objects

let person = { age: 29, name: `John`};
map.add(person.name, person);

const ages = mapToArray(map, (key, person) => person.age);
// [29, ...]
Copy

In the above example, the transformer function returns a number, but it could just as well return a transformed version of the input:

// Return with random heights and uppercased name
mapToArray(map, (key, person) => ({
 ...person,
 height: Math.random(),
 name: person.name.toUpperCase();
}))
// Yields:
// [{height: 0.12, age: 29, name: "JOHN"}, ...]
Copy