# React Conditional Component

A React component designed to simplify conditional rendering and list iteration, providing a more readable and maintainable alternative to ternary operators and verbose conditional logic.

## Installation

```bash
npm install react-ternary-be-gone
# or
yarn add react-ternary-be-gone

Usage

import Conditional, { Case, If, ElseIf, Else } from 'react-ternary-be-gone';

// Basic conditional rendering
<Conditional when={true}>
  <p>This will be rendered.</p>
</Conditional>

<Conditional when={55>33}>
  <p>55 is bigger than 33</p>
</Conditional>

<Conditional when={false} fallback={<p>This is the fallback.</p>}>
  <p>This will not be rendered.</p>
</Conditional>

// Iterating over a list
const items = ['Item 1', 'Item 2', 'Item 3'];

<Conditional each={items}>
  {(item, index) => <p key={index}>{item}</p>}
</Conditional>

// Switch-case rendering
const value = 'b';

<Conditional switch={value}>
  <Case when="a">A selected</Case>
  <Case when="b">B selected</Case>
  <Case default>None selected</Case>
</Conditional>

// If-ElseIf-Else rendering
const status = 'loading';

<Conditional>
  <If when={status === 'loading'}>
  <p>Loading...</p>
  </If>
  <ElseIf when={status === 'success'}>
  <p>Success!</p>
  </ElseIf>
  <Else>
  <p>Status unknown.</p>
  </Else>
</Conditional>

// If-ElseIf-Else with advanced props
const users = [{ id: 1, name: 'Alice', active: true }, { id: 2, name: 'Bob', active: false }];

<Conditional>
  <If when={users.length > 0} each={users} filter={user => user.active}>
    {(user) => <p>{user.name}</p>}
  </If>
  <Else>
  <p>No users found.</p>
  </Else>
</Conditional>

If-ElseIf-Else Blocks

You can use <If>, <ElseIf>, and <Else> as children of <Conditional> (without any prop on Conditional itself) to mimic if-else if-else logic. The first matching block is rendered. You can use all Conditional props (each, filter, sort, etc.) on these blocks.

Example:

import Conditional, { If, ElseIf, Else } from 'react-ternary-be-gone';

const status = 'success';

<Conditional>
  <If when={status === 'loading'}>
    <p>Yükleniyor...</p>
  </If>
  <ElseIf when={status === 'success'}>
    <p>Başarılı!</p>
  </ElseIf>
  <Else>
    <p>Durum bilinmiyor.</p>
  </Else>
</Conditional>

Advanced Example (with array props):

const users = [{ id: 1, name: 'Alice', active: true }, { id: 2, name: 'Bob', active: false }];

<Conditional>
  <If when={users.length > 0} each={users} filter={user => user.active}>
    {(user) => <p>{user.name}</p>}
  </If>
  <Else>
    <p>Kullanıcı yok.</p>
  </Else>
</Conditional>

You can use multiple <ElseIf> blocks. The first matching block is rendered. All Conditional props (each, filter, sort, etc.) are supported on If/ElseIf/Else blocks.

switch (Switch-Case Rendering)

Allows you to use switch-case style rendering with <Case> children. The switch prop sets the value to match, and each <Case when={...}>...</Case> child is checked. If no match is found, <Case default>...</Case> is rendered if present.

Type: any

Example:

import Conditional, { Case } from 'react-ternary-be-gone';

const value = 'b';

<Conditional switch={value}>
  <Case when="a">A seçildi</Case>
  <Case when="b">B seçildi</Case>
  <Case default>Hiçbiri seçilmedi</Case>
</Conditional>

<Case>

Child component for use with switch prop. Use when for matching value, and default for the default case.

Props:

• when: Value to match against the switch prop.
• default: Boolean, renders if no other case matches.

Example:

<Conditional switch={status}>
  <Case when="loading">Loading...</Case>
  <Case when="success">Success!</Case>
  <Case default>Status unknown.</Case>
</Conditional>

Props

when

A boolean value that determines whether the children should be rendered.

Type: boolean

Example:

<Conditional when={isLoggedIn}>
  <p>Welcome, user!</p>
</Conditional>

each

An array to iterate over and render children for each item.

Type: array

Example:

const data = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];

<Conditional each={data}>
  {(item, index) => <p key={item.id}>{item.name}</p>}
</Conditional>

children

The content to be rendered based on the when condition or for each item in the each array. Can be a React node or a render prop function.

Type: ReactNode | (item: any, index: number, array: any[]) => ReactNode

Example (ReactNode):

<Conditional when={true}>
  <p>This is a simple paragraph.</p>
</Conditional>

Example (Render Prop):

const items = ['A', 'B', 'C'];

<Conditional each={items}>
  {(item, index) => <p key={index}>Item {index + 1}: {item}</p>}
</Conditional>

fallback

The content to be rendered if the when condition is false or the each array is empty.

Type: ReactNode

Example:

<Conditional when={false} fallback={<p>Not logged in.</p>}>
  <p>Welcome!</p>
</Conditional>

empty

The content to be rendered if the each array is empty. Overrides fallback when iterating.

Type: ReactNode

Example:

const emptyList = [];

<Conditional each={emptyList} empty={<p>No items found.</p>}>
  {(item) => <p>{item}</p>}
</Conditional>

loading

A boolean value indicating whether the component is in a loading state. If true, the fallback prop (or a default loading message) will be rendered.

Type: boolean

Example:

<Conditional loading={isLoading} fallback={<p>Loading data...</p>}>
  <p>Data loaded!</p>
</Conditional>

error

An error message to be displayed if an error occurs.

Type: string

Example:

<Conditional error={errorMessage}>
  <p>Content.</p>
</Conditional>

keyExtractor

A function to extract a unique key for each item when iterating over the each array.

Type: (item: any, index: number) => string | number

Default: (item, index) => index

Example:

const users = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];

<Conditional each={users} keyExtractor={(user) => user.id}>
  {(user) => <p key={user.id}>{user.name}</p>}
</Conditional>

filter

A function to filter the each array before rendering.

Type: (item: any) => boolean

Example:

const numbers = [1, 2, 3, 4, 5, 6];

<Conditional each={numbers} filter={(num) => num % 2 === 0}>
  {(num) => <p>{num}</p>} {/* Renders 2, 4, 6 */}
</Conditional>

sort

A function to sort the each array before rendering.

Type: (a: any, b: any) => number

Example:

const items = [{ name: 'Charlie' }, { name: 'Alice' }, { name: 'Bob' }];

<Conditional each={items} sort={(a, b) => a.name.localeCompare(b.name)}>
  {(item) => <p>{item.name}</p>} {/* Renders Alice, Bob, Charlie */}
</Conditional>

limit

A number to limit the number of items rendered from the each array.

Type: number

Example:

const items = ['A', 'B', 'C', 'D', 'E'];

<Conditional each={items} limit={3}>
  {(item) => <p>{item}</p>} {/* Renders A, B, C */}
</Conditional>

reverse

A boolean value indicating whether to reverse the order of the each array before rendering.

Type: boolean

Example:

const items = ['A', 'B', 'C'];

<Conditional each={items} reverse>
  {(item) => <p>{item}</p>} {/* Renders C, B, A */}
</Conditional>

animate

A boolean value indicating whether to add a CSS class for animation purposes. You'll need to define the .conditional-animated CSS class in your project.

Type: boolean

Example:

<Conditional each={items} animate>
  {(item) => <p>{item}</p>}
</Conditional>

/* CSS (Example) */
.conditional-animated {
  /* Your animation styles here */
  transition: all 0.3s ease-in-out;
}

wrapper

A React component or element to wrap the rendered children. Defaults to React.Fragment.

Type: React.ComponentType

Example:

<Conditional each={items} wrapper="ul">
  {(item) => <li key={item}>{item}</li>}
</Conditional>

// Or with a custom component:
const MyWrapper = ({ children }) => <div className="my-wrapper">{children}</div>;

<Conditional each={items} wrapper={MyWrapper}>
  {(item) => <p>{item}</p>}
</Conditional>

debug

A boolean value that, when true, logs debugging information to the console, including the original and processed arrays.

Type: boolean

Example:

<Conditional each={items} debug>
  {(item) => <p>{item}</p>}
</Conditional>

onRender

A callback function that is called after the component renders. Provides information about the condition, item count, and whether the component is rendering conditionally or iterating.

Type: (data: { condition: boolean, itemCount: number, hasCondition: boolean, hasIteration: boolean }) => void

Example:

<Conditional
  each={items}
  onRender={({ itemCount }) => console.log(`Rendered ${itemCount} items`)}
>
  {(item) => <p>{item}</p>}
</Conditional>

Advanced Condition Evaluation Props

These props allow for more complex conditional checks without needing to define a separate when prop. Only one of these props should be used at a time.

gt (Greater Than)

Renders children if value is greater than target.

Type: { value: number, target: number }

Example:

<Conditional gt={{ value: 10, target: 5 }}>
  <p>10 is greater than 5</p>
</Conditional>

lt (Less Than)

Renders children if value is less than target.

Type: { value: number, target: number }

Example:

<Conditional lt={{ value: 3, target: 7 }}>
  <p>3 is less than 7</p>
</Conditional>

eq (Equal)

Renders children if value is equal to target.

Type: { value: any, target: any }

Example:

<Conditional eq={{ value: 'hello', target: 'hello' }}>
  <p>The strings are equal</p>
</Conditional>

ne (Not Equal)

Renders children if value is not equal to target.

Type: { value: any, target: any }

Example:

<Conditional ne={{ value: 1, target: 2 }}>
  <p>1 is not equal to 2</p>
</Conditional>

includes

Renders children if value (converted to a string) includes target.

Type: { value: string, target: string }

Example:

<Conditional includes={{ value: 'hello world', target: 'world' }}>
  <p>The string includes "world"</p>
</Conditional>

startsWith

Renders children if value (converted to a string) starts with target.

Type: { value: string, target: string }

Example:

<Conditional startsWith={{ value: 'hello world', target: 'hello' }}>
  <p>The string starts with "hello"</p>
</Conditional>

endsWith

Renders children if value (converted to a string) ends with target.

Type: { value: string, target: string }

Example:

<Conditional endsWith={{ value: 'hello world', target: 'world' }}>
  <p>The string ends with "world"</p>
</Conditional>

match

Renders children if value (converted to a string) matches the provided regular expression pattern.

Type: { value: string, pattern: string }

Example:

<Conditional match={{ value: 'hello 123', pattern: '\\d+' }}>
  <p>The string contains a number</p>
</Conditional>

useConditionalHelpers Hook

A hook providing helper functions to simplify common conditional logic and array manipulation tasks.

Usage

import { useConditionalHelpers } from 'react-ternary-be-gone';

const MyComponent = () => {
  const { isEmpty, isNotEmpty, hasLength, isEven, isOdd, sortBy, filterBy, unique } = useConditionalHelpers();
  const myArray = [1, 2, 3];

  return (
    <>
      <Conditional {...isEmpty(myArray)}>
        <p>Array is empty</p>
      </Conditional>
      <Conditional {...isNotEmpty(myArray)}>
        <p>Array is not empty</p>
      </Conditional>
    </>
  );
};

Helper Functions

isEmpty(array)

Checks if an array is empty or null/undefined. Returns an object suitable for the when prop.

Parameters:

• array: The array to check.

Returns: { when: boolean }

Example:

const { isEmpty } = useConditionalHelpers();
const emptyArray = [];

<Conditional {...isEmpty(emptyArray)}>
  <p>This array is empty.</p>
</Conditional>

isNotEmpty(array)

Checks if an array is not empty. Returns an object suitable for the when prop.

Parameters:

• array: The array to check.

Returns: { when: boolean }

Example:

const { isNotEmpty } = useConditionalHelpers();
const myArray = [1, 2, 3];

<Conditional {...isNotEmpty(myArray)}>
  <p>This array is not empty.</p>
</Conditional>

hasLength(array, length)

Checks if an array has a specific length. Returns an object suitable for the when prop.

Parameters:

• array: The array to check.
• length: The expected length.

Returns: { when: boolean }

Example:

const { hasLength } = useConditionalHelpers();
const myArray = [1, 2, 3];

<Conditional {...hasLength(myArray, 3)}>
  <p>This array has a length of 3.</p>
</Conditional>

isEven(num)

Checks if a number is even. Returns an object suitable for the when prop.

Parameters:

• num: The number to check.

Returns: { when: boolean }

Example:

const { isEven } = useConditionalHelpers();

<Conditional {...isEven(4)}>
  <p>4 is an even number.</p>
</Conditional>

isOdd(num)

Checks if a number is odd. Returns an object suitable for the when prop.

Parameters:

• num: The number to check.

Returns: { when: boolean }

Example:

const { isOdd } = useConditionalHelpers();

<Conditional {...isOdd(5)}>
  <p>5 is an odd number.</p>
</Conditional>

sortBy(field, order = 'asc')

Returns a sort function to sort an array of objects by a specific field. Suitable for the sort prop.

Parameters:

• field: The field to sort by.
• order: The sort order ('asc' or 'desc'). Defaults to 'asc'.

Returns: (a: any, b: any) => number

Example:

const { sortBy } = useConditionalHelpers();
const items = [{ name: 'Charlie' }, { name: 'Alice' }, { name: 'Bob' }];

<Conditional each={items} sort={sortBy('name')}>
  {(item) => <p>{item.name}</p>} {/* Renders Alice, Bob, Charlie */}
</Conditional>

<Conditional each={items} sort={sortBy('name', 'desc')}>
  {(item) => <p>{item.name}</p>} {/* Renders Charlie, Bob, Alice */}
</Conditional>

filterBy(field, value)

Returns a filter function to filter an array of objects by a specific field and value. Suitable for the filter prop.

Parameters:

• field: The field to filter by.
• value: The value to filter for.

Returns: (item: any) => boolean

Example:

const { filterBy } = useConditionalHelpers();
const users = [{ id: 1, name: 'Alice', active: true }, { id: 2, name: 'Bob', active: false }];

<Conditional each={users} filter={filterBy('active', true)}>
  {(user) => <p>{user.name}</p>} {/* Renders Alice */}
</Conditional>

unique(array, key)

Returns a new array with only unique items, based on a key or a key extractor function.

Parameters:

• array: The array to process.
• key: The key to use for uniqueness (string) or a function that extracts the key (function).

Returns: any[]

Example:

const { unique } = useConditionalHelpers();
const items = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }, { id: 1, name: 'Charlie' }];

const uniqueItems = unique(items, 'id'); // Removes the duplicate ID 1
// uniqueItems will be: [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }]

const items2 = [{name: "Apple", color: "red"}, {name: "Banana", color: "yellow"}, {name: "Cherry", color: "red"}];
const uniqueItems2 = unique(items2, (item) => item.color);
// uniqueItems2 will be: [{name: "Apple", color: "red"}, {name: "Banana", color: "yellow"}]

Contributing

Contributions are welcome! Please fork the repository and submit a pull request.

License

MIT