JSPM

Test if an object's own and inherited property is readable and writable.

Test if an object's own or inherited property has a data descriptor.

Test if an object's own or inherited property is readable.

Test if an object's own property has a data descriptor.

Test if a value is an ndarray-like object containing single-precision complex floating-point numbers.

Check if running in a Node.js REPL environment.

Test if a value is an array-like object containing only nonnegative numbers.

Test whether a value is a property key.

Test if a value is an email address.

Test if a value is a number having a finite negative value.

Test if a value is a 2-dimensional ndarray-like object containing single-precision complex floating-point numbers.

Test if a value is an EvalError object.