JSPM

Test if a value is a lowercase string.

Test if an object's own or inherited property is non-enumerable.

Test if a value is a skew-persymmetric matrix.

Test if a value is a number having a safe integer value.

Test whether an object contains a nested key path, either own or inherited.

Test whether an object contains a nested key path.

Test if a value is a 1-dimensional ndarray-like object containing double-precision floating-point numbers.

Test if a value is an alphagram.

Test if two arguments are both double-precision complex floating-point numbers and have the same value.

Test if a value is an anagram.

Test if a value is an odd number.

Test if a value is the current year.

Boolean indicating if the current environment is a touch device.

Test if a value is a duration string.

Test if a value is a 1-dimensional ndarray-like object containing single-precision floating-point numbers.

Boolean indicating if the current environment is a mobile device.

Test if a value is a SyntaxError object.

Test if a value is falsy.

Test if a value is an array-like object containing only truthy values.

Test if a value is a square number.

Test if a value is an absolute path.

Check if the runtime is Electron.

Test if a value is a camelcase string.

Test if a value is a number having a nonpositive value.

Test if a value is a lowercase string.

Test if a value is an empty string.

Test if two arguments are both single-precision complex floating-point numbers and have the same value.

Test whether a value is a relative URI.

Test whether a string matches a Node.js built-in module name.

Test if a value is a persymmetric matrix.

Test if a value is an array-like object containing only safe integers.

Check if an environment is big endian.

Test if a value is a skew-centrosymmetric matrix.

Test if a value is a generator object.

Test if a value is a SharedArrayBuffer.

Test if a value is a plain object containing a circular reference.

Test if a value is a composite number.

Test whether a value is an absolute HTTP(S) URI.

Test if two arguments have the same native class.

Test if a value is a 1-dimensional ndarray-like object containing single-precision complex floating-point numbers.

Test if a value is truthy.

Test if a value is named typed tuple-like.

Test whether a string contains only alphanumeric characters.

Test if a value is a blank string.

Test if a value is a 64-bit or 128-bit complex number.

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

Test whether a string contains only numeric digits.

Test whether a value is a relative URI.

Test if a value is a blank string.

Test if a value is an array containing a circular reference.

Test if an object has an inherited property.

Test if a value is a URI.

Test whether a string contains only white space characters.

Test if a value is an array-like object where every element is between two values.

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

Assertion utility tools.

Test whether a string contains only white space characters.

Test if a value is an array-like object containing only nonpositive integers.

Check if the runtime is the Electron renderer process.

Test if a value is the current year.

Test if a value is a string in Pascal case.

Test if a value is a 1-dimensional ndarray-like object containing double-precision complex floating-point numbers.

Test if a value is a string in kebab case.

Test whether a value is a property key.

Test if a value is a string having an uppercase first character.

Test if a value is an `ArrayBuffer` view.

Check if the runtime is a web worker.

Test if a value is a binary string.

Test if a value is an array-like object containing only Date objects.

Test if a value corresponds to a leap year in the Gregorian calendar.

Test if a value is a string in snake case.

Test if a value is a binary string.

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

Test if two arguments have the same type.

Check if an environment is little endian.

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

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

Test if a value is an arrow function.

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

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

Test if an object's own or inherited property is write-only.

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

Test if a string is a well-formed string.

Test if an object's own property is write-only.

Test if a value is a UNC path.

Test whether a string contains only hexadecimal digits.

Test if a value is a string in snake case.

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

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

Test if a value is a camelcase string.

Test if a value is an array-like object containing only null values.

Check if running in a Node.js REPL environment.

Test whether a string matches a Node.js built-in module name.

Test whether a character belongs to the ASCII character set and whether this is true for all characters in a provided string.

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

Test if a value is a duration string.

Test if a value is an empty array-like object.

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

Test if a value is a string in Pascal case.

Test if a value is a URIError object.

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

Test if a value is a ragged nested array

Test if a value is generator object-like.

Test if a value is a domain name.

Test if two arguments are strictly equal.

Test if an object's own property is configurable.

Test if an object's own property has an accessor descriptor.

Test if a value is a non-symmetric matrix.

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

Check if the runtime is the main Electron process.

Test if a value is an array-like object containing only negative integers.

Test if a value is a startcase string.

Test if a value is a regular expression string.

Test whether a value is an absolute URI.

Test if two values are both Date objects corresponding to the same date and time.

Test if two arguments are both BooleanArrays and have the same values.

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

Test if an object's own property is readable.

Test if an object's own or inherited property is read-only.

Test if a value is an uppercase string.

Test whether a value is an absolute HTTP(S) URI.

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

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

Check if the process is running in a Docker container.

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

Test if a value is an array-like object containing only JavaScript primitives.

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

Test if a value is a valid typed array length.

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.

Test if a value is an email address.