default-values

Default Values

This library aims to provide the most necessary default values. Stop creating variables all over the code!

Installation

For npm

npm install default-values

For yarn

yarn add default-values

Includes

• empty array: 'EMPTY_ARRAY' or 'E_ARR';
• empty object: 'EMPTY_OBJECT' or 'E_OBJ';
• empty callback: 'EMPTY_CALLBACK' or 'E_CB';

What's the problem?

We all use some default values. And we can do it as follows:

const myValue = someValue ?? {}; // {} - defualt value
// or
myValue ??= []; // [] - default value
// or ...

But sometimes we need to have a stable reference to the default value for some tasks. Let's look at the following React component.

const ParentComponent = () => {
  // ...
  const list = listOrNull ?? [];
  return <MemoHeavyList list={list} />
}

If the variable 'listOrNull' is null, then each time the Parent Component function is called, the variable 'list' will have a new reference to an empty array, which will cause the 'MemoHeavyList' component rerender.

We can solve this problem as follows:

import {EMPTY_ARRAY} from 'default-values'

const ParentComponent = () => {
  // ...
  const list = listOrNull ?? EMPTY_ARRAY; // EMPTY_ARRAY instead of [];
  return <MemoHeavyList list={list} />
}

For such cases, the library provides various typical variables that can be used as default values.

Author

Sergey Rozhkov

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License

Default Values is MIT licensed, as found in the LICENSE file.