array-utils.js

This package provides some simple callbacks for native Array methods (eg. filter, reduce) which I use quite often.

List of functions

excludeEmpty()

Removes from array falsey values.

import {excludeEmpty} from '@radmen/array-utils';

const values = [0, 1, '', null];
values.filter(excludeEmpty()); // [1]

replaceWith(predicate, replaceWithData)

Replaces entries from array, which match a predicate with a new value

import {replaceWith} from '@radmen/array-utils';

const values = ['foo', 'bar'];
values.map(replaceWith(item => item === 'foo', 'bar')); // ['bar', 'bar'];

Second argument may be a callback which will provide data for replacement:

values.map(replaceWith(filterByValue('foo'), item => `${item}Bar`)); // ['fooBar', 'bar'];

extendWith(predicate, extendWithData)

Extends object with a given object

import {extendWith} from '@radmen/array-utils'

const values = [
  {name: 'foo'},
  {name: 'bar'},
];

values.map(extendWith(item => item.name === 'foo', { active: true }); // [{name: 'foo', active: true}, {name: 'bar'}];

pushToBottom(predicate)

Moves items matching predicate to end of an array.

import {pushToBottom} from '@radmen/array-utils';

const values = ['foo', 'bar', 'baz'];
values.sort(pushToBottom(item => item === 'foo')); // ['bar', 'baz', 'foo'];

pushToTop(predicate)

Move item matching predicate to beginning of an array

import {pushToTop} from '@radmen/array-utils';

const values = ['foo', 'bar', 'baz'];
values.sort(pushToTop(item => item === 'baz')); // ['baz', 'foo', 'bar'];

filterByValue(value[, secondValue[, ...]])

Filters array values by given value.

import {filterByValue} from '@radmen/array-utils';

const values = ['foo', 'bar', 'baz'];
values.filter(filterByValue('foo')); // ['foo'];

Function accepts more then one value:

values.filter(filterByValue('foo', 'bar')); // ['foo', 'bar'];

filterByKeyValue(key, value[, secondValue[, ...]])

Filters array of objects by given attribute value.

import {filterByKeyValue} from '@radmen/array-utils';

const values = [{name: 'foo'}, {name: 'bar'}, {name: 'baz'}];
values.filter(filterByKeyValue('name', 'bar')); // [{name: 'bar'}];

Function accepts more then one value:

values.filter(filterByKeyValue('name', 'bar', 'foo')); // [{name: 'foo'}, {name: 'bar'}];

collapse()

Collapses a collection of arrays into a flat collection.

import {collapse} from '@radmen/array-utils';

const values = [[1, 2], [3, 4], [5]];
values.reduce(collapse()); // [1, 2, 3, 4, 5];