@hckrnews/arrays

Array Helpers

Array helpers, so you can get very fast your data from the array.

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Example usage

here an example array.

import { Arr } from '@hckrnews/arrays';

var exampleArray = new Arr([
    {
        id: 0,
        name: 'John',
        age: 93,
        city: 'Patmos',
    },
    {
        id: 1,
        name: 'Peter',
        age: 62,
        city: 'Rome',
    },
    {
        id: 2,
        name: 'Luke',
        age: 84,
        city: 'Boeotia'
    },
    {
        id: 2,
        name: 'Paul',
        age: 62,
        city: 'Rome'
    },
]);

All methods:

• multisort
• multifilter
• multikey
• intersect
• diff
• unique
• pushIfNotExists
• pushMultipleIfNotExists
• pushMultiple
• max
• min
• random
• summ
• average
• first
• last
• update

multisort

Sort an array with objects by the key of the object.

By default it is asc, and you can set desc as an optional value to the 2nd parameter.

exampleArray.multisort('age', 'desc');

[
    {
        id: 0,
        name: 'John',
        age: 93,
        city: 'Patmos',
    },
    {
        id: 2,
        name: 'Luke',
        age: 84,
        city: 'Boeotia'
    },
    {
        id: 1,
        name: 'Peter',
        age: 62,
        city: 'Rome',
    },
    {
        id: 2,
        name: 'Paul',
        age: 62,
        city: 'Rome'
    },
]

multifilter

Filters the array for a given key and value.

If the 3th parameter is true, excluding a given key and value.

exampleArray.multifilter('age', '62');

[
    {
        id: 1,
        name: 'Peter',
        age: 62,
        city: 'Rome',
    },
    {
        id: 2,
        name: 'Paul',
        age: 62,
        city: 'Rome'
    },
]


exampleArray.multifilter('age', '62', '!=');

[
    {
        id: 0,
        name: 'John',
        age: 93,
        city: 'Patmos',
    },
    {
        id: 2,
        name: 'Luke',
        age: 84,
        city: 'Boeotia'
    },
]


exampleArray.multifilter('age', '62', '>');

[
    {
        id: 0,
        name: 'John',
        age: 93,
        city: 'Patmos',
    },
    {
        id: 2,
        name: 'Luke',
        age: 84,
        city: 'Boeotia'
    },
]


exampleArray.multifilter('age', '84', '<=');

[
    {
        id: 2,
        name: 'Luke',
        age: 84,
        city: 'Boeotia'
    },
    {
        id: 1,
        name: 'Peter',
        age: 62,
        city: 'Rome',
    },
    {
        id: 2,
        name: 'Paul',
        age: 62,
        city: 'Rome'
    },
]


exampleArray.multifilter('name', ['John', 'Peter']);

[
    {
        id: 0,
        name: 'John',
        age: 93,
        city: 'Patmos',
    },
    {
        id: 1,
        name: 'Peter',
        age: 62,
        city: 'Rome',
    },
]

multikey

Plucks the given keys from the array.

exampleArray.multikey(['name', 'age']);

[
    {
        name: 'John',
        age: 93
    },
    {
        name: 'Peter',
        age: 62
    },
    {
        name: 'Luke',
        age: 84
    },
    {
        name: 'Paul',
        age: 62
    },
]

intersect

Computes the intersection of arrays. Returns an array containing the values that are present in all the arrays.

If the 2nd parameter is true, the 1st parameter can contain multiple arrays.

var a = new Arr(['John', 'Peter', 'Luke']);
var b = ['Peter', 'Luke', 'Paul'];
var c = ['Luke', 'Paul', 'John'];

a.intersect(b);

['Peter', 'Luke']

To compute the intersection of multiple arrays, you can send an array and set the 2nd parameter to true.

a.intersect([b, c], true);

['Luke']

diff

Computes the difference of arrays. Compares the array values, and return all values from array a that arent present in array b.

If the 2nd parameter is true, it return all values that are not present in any of the arrays.

var a = new Arr(['John', 'Peter', 'Luke']);
var b = ['Peter', 'Luke', 'Paul'];

a.diff(b);

['John']

Symmetrical Diff

a.diff(b, true);

['John', 'Paul']

unique

Removes duplicate values from an array. Takes the array and returns a new array without duplicate values.

var a = new Arr(['John', 'Peter', 'Luke', 'Peter', 'Luke', 'Paul']);

a.unique;

['John', 'Peter', 'Luke', 'Paul']

pushIfNotExists

Only push the value to the array if the value doesnt exists in the array.

Returns the new length property of the object upon which the method was called.

var a = new Arr();

a.pushIfNotExists('John');

['John']

a.pushIfNotExists('Peter');

['John', 'Peter']

a.pushIfNotExists('John');

['John', 'Peter']

pushMultipleIfNotExists

Add multiple values to an array. Only push the value to the array if the value doesnt exists in the array.

Returns the new length property of the object upon which the method was called.

var a = new Arr();

a.pushMultipleIfNotExists([
    'John',
    'Peter'
]);

[
    'John',
    'Peter'
]

a.pushMultipleIfNotExists([
    'Luke',
    'Paul'
]);

[
    'John',
    'Peter',
    'Luke',
    'Paul'
]

a.pushMultipleIfNotExists([
    'John',
    'Peter'
]);

[
    'John',
    'Peter',
    'Luke',
    'Paul'
]

pushMultiple

Add multiple values to an array.

Returns the new length property of the object upon which the method was called.

var a = new Arr();

a.pushMultiple([
    'John',
    'Peter'
]);

[
    'John',
    'Peter'
]

a.pushMultiple([
    'Luke',
    'Paul'
]);


[
    'John',
    'Peter',
    'Luke',
    'Paul'
]

max

The largest of the given numbers. If at least one of the arguments cannot be converted to a number, NaN is returned.

var exampleArray = new Arr([1,2,3]);

exampleArray.max;

3

min

The smallest of the given numbers. If at least one of the arguments cannot be converted to a number, NaN is returned.

var exampleArray = new Arr([1,2,3]);

exampleArray.min;

1

random

Get a random value of an array.

var exampleArray = new Arr([1,2,3]);

exampleArray.random;

e.g. 2

summ

The summ of all values.

var exampleArray = new Arr([1,2,3]);

exampleArray.summ;

6

average

Get the average of all values.

var exampleArray = new Arr([1,2,3]);

exampleArray.average;

2

first

Get the first of all values.

var exampleArray = new Arr([1,2,3]);

exampleArray.first;

1

last

Get the last of all values.

var exampleArray = new Arr([1,2,3]);

exampleArray.last;

3

update

Update items in an array.

var exampleArray = new Arr([
    {
        id: 1,
        name: 'first'
    },
    {
        id: 2,
        name: 'second'
    }
]);

exampleArray.update(
    [
        {
            id: 2,
            name: 'last'
        }
    ],
    [
        'id'
    ]
);

[
    {
        id: 1,
        name: 'first'
    },
    {
        id: 2,
        name: 'last'
    }
]

Test the package.

npm test

This will run all the tests in the test folder with mocha.

If you only want to check the eslint rules, just run.

npm run lint

node.js

To include @hckrnews/arrays in Node, first install with npm.

npm install @hckrnews/arrays

Use the package in your node files.

import { Arr } from '@hckrnews/arrays';

Than you can use all array helpers from this package in your node files.

An example is included example/node.js