funis

Appearance

On this page

groupToEntries ​

ts
function groupToEntries<K, V>(
    arr: readonly V[],
    cb: (item: V) => K
): readonly (readonly [K, readonly V[]])[]

Group the items by the returned value of the callback. Then return the groups in entries.

Example ​

ts
arr.groupToEntries(
    [
        { type: 'grass', name: 'bulbasaur' },
        { type: 'fire', name: 'charmander' },
        { type: 'water', name: 'squirtle' },
        { type: 'bug', name: 'caterpie' },
        { type: 'water', name: 'psyduck' },
    ],
    item => item.type,
) /* [
    ['grass', [{ type: 'grass', name: 'bulbasaur' }]],
    ['fire', [{ type: 'fire', name: 'charmander' }]],
    ['water', [
        { type: 'water', name: 'squirtle' },
        { type: 'water', name: 'psyduck' },
    ]],
    ['bug', [{ type: 'bug', name: 'caterpie' }]],
] */