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A simple library to determine whether the object is null-like or not.
- null
- undefined
- null-like
- undefined-like
- is-null
- is-undefined
- is-null-like
- is-undefined-like
- is-null-or-undefined
Utilities to determine if string is any of the following null, empty, undefined, NaN, or whitespace.
Returns whether or not the passed arguments are defined - ie. not undefined
A meteor framework item
The package provides methods to check whether a JSON object or a JSON array is empty or not. - The package considers an **object** empty when it is `null`, `undefined` or has no keys. - The package considers an **array** empty when it is `null`, `undefine
A shorthand helper function for the pattern: const x = (typeof y !== 'undefined' ? y : 'default-value');
Function that filters undefined items from an array.
Escape the dreaded Uncaught TypeError: Cannot read property 'a' of undefined
Guard against null and undefined values
Convert any value into a boolean value.
Type checker for JS
一些常用工具方法的集合
I'm Mr. Meeseeks! Look at me! I can get any nested value for you from the most complex objects.
Validates if a value is an array of JavaScript primitives.
- validate.io
- validate
- validation
- validator
- valid
- primitive
- array
- is
- null
- boolean
- string
- number
- undefined
- primitivearray
Validate the type of array's items.
undefined is not a function and it's likely to remain so forever
A package for judging a string is null or empty or undefined
Simple method for defining a default value when a value is undefined
A meteor framework item
A collection of useful helper functions