has-value

What is has-value?

The has-value npm package is used to check if a value exists, is not empty, or is not undefined. It is useful for validating data and ensuring that required fields are populated.

What are has-value's main functionalities?

Check if a value exists

This feature checks if a given value exists. In this example, the string 'Hello World' is checked, and since it is a non-empty string, the result is true.

const hasValue = require('has-value');
console.log(hasValue('Hello World')); // true

Check if an object property has a value

This feature checks if a specific property of an object has a value. In this example, the object has a property 'name' with a value 'John Doe', so the result is true.

const hasValue = require('has-value');
const obj = { name: 'John Doe' };
console.log(hasValue(obj, 'name')); // true

Check if an array has a value

This feature checks if an array has any values. In this example, the array [1, 2, 3] is checked, and since it contains elements, the result is true.

const hasValue = require('has-value');
const arr = [1, 2, 3];
console.log(hasValue(arr)); // true

Check if a nested object property has a value

This feature checks if a nested property within an object has a value. In this example, the nested property 'user.name' is checked, and since it has a value 'Jane Doe', the result is true.

const hasValue = require('has-value');
const nestedObj = { user: { name: 'Jane Doe' } };
console.log(hasValue(nestedObj, 'user.name')); // true

Other packages similar to has-value

lodash

Lodash is a popular utility library that provides a wide range of functions for manipulating arrays, objects, and other data types. It includes a method `_.has` to check if a property exists in an object, which is similar to the functionality provided by has-value.

underscore

Underscore is another utility library similar to Lodash. It provides a method `_.has` to check if an object contains a given property. While it does not specifically check for non-empty values, it can be used in combination with other methods to achieve similar results.

validator

Validator is a library for string validation and sanitization. It includes methods to check if a string is empty or not, which can be used to validate the presence of values in a similar way to has-value.

README

has-value

Returns true if a value exists, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays. Other libs do this, but I needed one that would optionally not treat zero as empty.

Install

Install with npm:

npm i has-value --save-dev

Run tests

npm test

Usage

var hasValue = require('has-value');

hasValue('a');
//=> true

hasValue('');
//=> false

hasValue(1);
//=> true

hasValue(0);
//=> false

hasValue(0, true); // treat zero as a value
//=> true

hasValue({a: 'a'}});
//=> true

hasValue({}});
//=> false

hasValue(['a']);
//=> true

hasValue([]);
//=> false

hasValue(function(foo) {}); // function length/arity
//=> true

hasValue(function() {});
//=> false

hasValue(true);
hasValue(false);
//=> true

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright (c) 2014 Jon Schlinkert, contributors.
Released under the MIT license

---

This file was generated by verb-cli on September 21, 2014.