helprjs

helprjs

Easy to use collection of useful methods for manipulating object arrays with added helpers

Example array of objects

Most of the examples here make use of this people object.

const people = [
    { id: 1, firstName: 'John', secondName: 'Smith', age: '61', status: 1 },
    { id: 2, firstName: 'John', secondName: 'West', age: '55', status: true },
    { id: 3, firstName: 'Brenda', secondName: 'Holt', age: '60', status: false },
    { id: 4, firstName: 'Sally', secondName: 'Brampton', age: '33', status: undefined },
    { id: 5, firstName: 'June', secondName: 'Chester', age: '47', status: NaN },
    { id: 6, firstName: 'Jack', secondName: 'Carter', age: '24', status: null },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
];

Example of use - React example

import { getEven } from 'helprjs';

function App() {

  const people = [
    { id: 1, firstName: 'John', secondName: 'Smith', age: '61', status: 1 },
    { id: 2, firstName: 'John', secondName: 'West', age: '55', status: true },
    { id: 3, firstName: 'Brenda', secondName: 'Holt', age: '60', status: false },
    { id: 4, firstName: 'Sally', secondName: 'Brampton', age: '33', status: undefined },
    { id: 5, firstName: 'June', secondName: 'Chester', age: '47', status: NaN },
    { id: 6, firstName: 'Jack', secondName: 'Carter', age: '24', status: null },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
    { id: 7, firstName: 'Jack', secondName: 'Foster', age: '58', status: 0 },
  ];

  const result = getEven(people,'age');

  return (
    <div className="App">
      <h1>Users with an even age</h1>
      <table>
        <tr>
          <th scope="col">First Name</th>
          <th scope="col">Second Name</th>
          <th scope="col">Age</th>
        </tr>
      {result && result.map((item, index) =>
          <tr key={index}>
            <td>{item.firstName}</td>
            <td>{item.secondName}</td>
            <td>{item.age}</td>
          </tr>)
      }
      </table>
    </div>
  );
}

export default App;

Methods

Methods can be grouped into the following categories:

General : object array manipulation

Array: array only

Boolean : returns true or false

Helpers : deals with values

Numerical : uses numerical data

General

addNewProperty - Demo

addNewProperty(people, 'registered', true)
adds new key value to all objects

countKeys - Demo

countKeys({a:1, b:2, c:3});
// 3

getEven - Demo

getEven(people,'age');
returns objects containing only even values

getObject

getObject(people,2);
returns an object from an array from array key

getOdd - Demo

getOdd(people,'age');
returns objects containing only odd values

getValues

getValues(people, 'firstName');
// ["John", "John", "Brenda", "Sally", "June", "Jack", "Jack"]

groupByKey

groupByKey(people, 'firstName')
// {John: Array(2), Brenda: Array(1), Sally: Array(1), June: Array(1), Jack: Array(2)}

randomOrder

randomOrder(people);
returns randomly ordered array

removeFalsy

removeFalsy(people, 'status');
removes all objects containing falsy values

removeValue

removeValue(people,'firstName', 'John');
remove all objects that have this value
Note: 1 and '1' will give a different result, be sure to include quotation marks if targetting a string

setAllValues

setAllValues(people, 'age', '25');
(sets all values to 25)

sortByKey

sortByKey(people, 'age');
returns object in value order

toArray

toArray(people, 'age');
// ["61","55","60","33","47","24","58"]

toLower

toLower(people, 'firstname');
returns object with values as lowercase

toUpper

toUpper(people, 'firstname');
returns object with values as uppercase

toString

toString(people, 'id');
returns object with values as a string

toTruncate

toTruncate(people, 'firstName', 3);
returns object with values truncated to numerical value

toNumber

toNumber(people, 'age');
returns object with values as numbers

Array

populateArray

populateArray(0,20,4)
// [4,8,12,16,20]

uniqueArray

uniqueArray(["one",1,1,2,3,"two","three","four","one","two"])
// ["one", 1, 2, 3, "two", "three", "four"]

intersectArrays

intersectArrays([0,1,2,3,4],[0,1,2,5,6])
// [0,1,2]

emptyArray

emptyArray(["one","two","three","four"])
// []

reverseArray

reverseArray([0,1,2,3,4,5,6])
// [6,5,4,3,2,1,0]

Boolean

isArray

isArray([1,2,3]);
// true

isBigint

isBigint(9007199254740991n);
// true

isBoolean

isBoolean(true);
// true

isNaN

isNaN(true);
// true

isNull

isNull(null);
// true

isNumber

isNumber(1);
// true

isObject

isObject({x:1, y:2});
// true

isString

isString('abc'});
// true

isSymbol

isSymbol(Symbol());
// true

isUndefined

isUndefined(undefined);
// true

Helpers

typeOf

typeOf(value);

// typeOf(1); returns "number"
// typeOf([1,2,3]); returns "array"
// typeOf({x: 1}); returns "object"

uuid

uuid();

// Random uuid generator
// uuid(); returns random id
// e.g. 8ac16a9e-12fc-44fd-8311-952d212cbe02

randomId

randomId();

// Random ID generator
// zxrm95d6ug

Numerical

getMaximum - Demo

getMaximum(people,'age');
// 61

getMinimum - Demo

getMinimum(people,'age');
// 24

getTotal - Demo

getTotal(people, 'age');
returns sum total