290 packages found
ES2015-compliant shim for Object.is - differentiates between -0 and +0
Is this an arguments object? It's a harder question than you think.
Returns true if an object was created by the `Object` constructor, or Object.create(null).
Get the native type of a value.
Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
Returns true if a value has the characteristics of a valid JavaScript data descriptor.
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
Check if a value is a plain object
Detect whether or not an object is a Typed Array
Function argument validation for humans
- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
- View more
Type check values
Test if a value is a plain object.
Returns true if the value is an object and not an array or null.
Returns true if a value is a plain object, array or function.
Test if a value is object-like.
Determines if an object can be used as an array
Test if a value is an object.
Test if a value is a string.
Test if a value is a boolean.