array-utils-ts

A set of functions for working with arrays, often necessary for working with state, but absent in lodash.

Install

npm i array-utils-ts

yarn add array-utils-ts

Usage

filterNullable

import { filterNullable } from "array-utils-ts"

filterNullable([1, null, 2, undefined])
// -> [1, 2]

filterEmpty

import { filterEmpty } from "array-utils-ts"

filterEmpty([1, null, 2, undefined, 3, "", "a"])
// -> [1, 2, 3, "a"]

isUniq

import { isUniq } from "array-utils-ts"

isUniq([1, 2, 3])
// -> true

isUniq([1, 2, 1])
// -> false

hasEmpty

import { hasEmpty } from "array-utils-ts"

hasEmpty(["a", "b", "c"])
// -> false

hasEmpty(["a", "", "c"])
// -> true

hasEmpty(["a", undefined, "c"])
// -> true

toggleItem

For example useful in <select> component

import { toggleItem } from "array-utils-ts"

toggleItem([1, 2, 3], 4)
// -> [1, 2, 3, 4]

toggleItem([1, 2, 3], 3)
// -> [1, 2]

updateByKey

import { updateByKey } from "array-utils-ts"

// prettier-ignore
const arr1 = [{ id: 1, v: 1 }, { id: 2, v: 1 }]

const arr2 = updateByKey(arr1, "id", { id: 1, v: 2 })
// -> [{ id: 1, v: 2 }, { id: 2, v: 1 }]
// arr1 !== arr2

const arr3 = updateByKey(arr2, "id", { id: 3, v: 1 })
// -> [{ id: 1, v: 2 }, { id: 2, v: 1 }]
// arr2 === arr3 // note: item not found, nothing changed

upsertByKey

import { upsertByKey } from "array-utils-ts"

// prettier-ignore
const arr1 = [{ id: 1, v: 1 }, { id: 2, v: 1 }]

const arr2 = upsertByKey(arr1, "id", { id: 1, v: 2 })
// -> [{ id: 1, v: 2 }, { id: 2, v: 1 }]
// arr1 !== arr2

const arr3 = upsertByKey(arr2, "id", { id: 3, v: 1 })
// -> [{ id: 1, v: 2 }, { id: 2, v: 1 }, { id: 3, v: 1 }]
// arr2 !== arr3

toggleByKey

import { toggleByKey } from "array-utils-ts"

// prettier-ignore
const arr1 = [{ id: 1, v: 1 }, { id: 2, v: 1 }]

const arr2 = toggleByKey(arr1, "id", { id: 1, v: 2 })
// -> [{ id: 2, v: 1 }]; arr1 !== arr2

const arr3 = toggleByKey(arr2, "id", { id: 3, v: 1 })
// -> [{ id: 2, v: 1 }, { id: 3, v: 1 }]; arr2 !== arr3

isFirstByKey

Check if given object is first in collection by some key.

import { isFirstByKey } from "array-utils-ts"

const arr = [{ id: 1 }, { id: 2 }, { id: 3 }]
isFirstByKey(arr, "id", { id: 1 }) // -> true
isFirstByKey(arr, "id", { id: 2 }) // -> false
isFirstByKey(arr, "id", { id: 3 }) // -> false

isLastByKey

Check if given object is last in collection by some key.

import { isLastByKey } from "array-utils-ts"

const arr = [{ id: 1 }, { id: 2 }, { id: 3 }]
isLastByKey(arr, "id", { id: 1 }) // -> false
isLastByKey(arr, "id", { id: 2 }) // -> false
isLastByKey(arr, "id", { id: 3 }) // -> true

enumerate

import { enumerate } from "array-utils-ts"

const arr = ["a", "b", "c"]
enumerate(arr) // -> [[0, "a"], [1, "b"], [2, "c"]]
enumerate(arr, 1) // -> [[1, "a"], [2, "b"], [3, "c"]]