@engineersamuel/istruthy

v1.0.1

Published

6 months ago

Truthiness with options

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smendenh

truthy truthiness isTruthy isFalsy

Table of Contents

Why

Most truthiness libraries are either extremely basic or simply adhere to the standard defnition of Truthy in JavaScript.

However, what happens when you want to consider '', [], {}, 0, or [null] false? This is where @engineersamuel/istruthy comes in.

Install

$ npm i -D @engineersamuel/istruthy

Usage

import { isTruthy, isFalsy } from '@engineersamuel/istruthy';

console.log(isTruthy('abc')); // prints true
console.log(isTruthy('', { isEmptyStringFalse: true })); // prints false

console.log(isFalse('abc')); // prints false
console.log(isFalsy('', { isEmptyStringFalse: true })); // prints true

See the *.spec.ts files in the ./test directory for a great reference on using isTruthy.

If you want to reference this library directly in html:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>My Page</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- Other resources here -->
    <!-- ... -->
    <!-- Assembler CSS -->
    <script src="https://cdn.jsdelivr.net/npm/@engineersamuel/[email protected]/dist/index.min.js"></script>
</head>
<body>
<!-- Your code here -->
  <script>
    console.log(Truthiness.isTruthy('abc')); // prints true
    console.log(Truthiness.isTruthy('', { isEmptyStringFalse: true })); // prints false

    console.log(Truthiness.isFalse('abc')); // prints false
    console.log(Truthiness.isFalsy('', { isEmptyStringFalse: true })); // prints true
  </script>
</body>
</html>

Note that the UMD is built with rollup.js (Which is minimally necessary considering there are no dependencies) and the global variable name is Truthiness hence in the above browser environment you would access isTruthy via Truthiness.isTruthy.

Config

| Option | Default | Description | |---|---|---| | isZeroFalse | false | When set to true then 0 will be will be evaluated to false. Ex. isTruthy(0, { isZeroFalse: true}); // returns false | | isInfinityFalse | false | When set to true then Infinity and -Infinity will be will be evaluated to false. Ex. isTruthy(Infinity, { isInfinityFalse: true}); // returns false | | isEmptyStringFalse | false | When set to true then '' will be will be evaluated to false. Ex. isTruthy('', { isEmptyStringFalse: true}); // returns false | | isEmptyObjectFalse | false | When set to true then {} will be will be evaluated to false. Ex. isTruthy({}, { isEmptyObjectFalse: true}); // returns false | | isEmptyArrayFalse | false | When set to true then [] will be will be evaluated to false. Ex. isTruthy([], { isEmptyArrayFalse: true}); // returns false | | isFilteredArrayFalse | false | When set to true then [null, undefined] will be will be evaluated to false. Ex. isTruthy([null, undefined], { isFilteredArrayFalse: true }); // returns false Note: This specific flag will recursively check each value, so passing options to isTruthy are recursively respected. | | isFalsyArrayFalse | false | When set to true then [null, undefined] will be will be evaluated to false. Ex. isTruthy([null, undefined], { isFalsyArrayFalse: true})/ // returns false Ex. isTruthy([0, ''], { isFalsyArrayFalse: true, isZeroFalse: true, isEmptyStringFalse: true }); // returns false Note: This specific flag will recursively check each value, so passing options to isTruthy are recursively respected. |

Testing

npm run test

  63 passing (38ms)

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files |     100 |      100 |     100 |     100 |
 index.ts |     100 |      100 |     100 |     100 |
----------|---------|----------|---------|---------|-------------------

Contributing

npm i
make code changes
npm run test
npm run lint
npm run build

Publishing

Bump the package.json version
npm publish --access public
git tag vx.y.z
git push origin --tags

License

MIT

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

Table of Contents

Why