Module basic module
  1. front page
  2. Basic module
  3. Module types

Module types

The types module provides tool functions for determining data types.

The following is a specific introduction and examples:

1
2
3
var util = require('util');
console.log(util.types.isDate(new Date()));
console.log(util.types.isRegExp(/some regexp/));

static function

isEmpty

Checks if the given variable contains no value (no enumerable properties)

1
static Boolean types.isEmpty(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if empty

isArray

Checks whether the given variable is an array

1
static Boolean types.isArray(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is an array

isBoolean

Tests whether the given variable is a Boolean

1
static Boolean types.isBoolean(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is Boolean, it returns True

isNull

Checks whether the given variable is Null

1
static Boolean types.isNull(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is Null, it returns True

isNullOrUndefined

Checks whether the given variable is Null or Undefined

1
static Boolean types.isNullOrUndefined(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is Null or Undefined, it returns True

isNumber

Tests whether the given variable is a number

1
static Boolean types.isNumber(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a number

isBigInt

Tests whether the given variable is a BigInt

1
static Boolean types.isBigInt(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a number

isString

Checks whether the given variable is a string

1
static Boolean types.isString(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a string

isUndefined

Checks whether the given variable is Undefined

1
static Boolean types.isUndefined(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is Undefined, return True

isRegExp

Tests whether the given variable is a regular object

1
static Boolean types.isRegExp(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a regular object

isObject

Tests whether the given variable is an object

1
static Boolean types.isObject(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is an object

isDate

Tests whether the given variable is a date object

1
static Boolean types.isDate(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a date object

isNativeError

Tests whether the given variable is an error object

1
static Boolean types.isNativeError(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is an error object

isPrimitive

Checks whether the given variable is of primitive type

1
static Boolean types.isPrimitive(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a primitive type

isSymbol

Check whether the given variable is of type Symbol

1
static Boolean types.isSymbol(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Symbol type, it returns True

isDataView

Checks whether the given variable is of type DataView

1
static Boolean types.isDataView(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a DataView type, it returns True

isExternal

Checks whether the given variable is of type External

1
static Boolean types.isExternal(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is an External type, it returns True

isMap

Check whether the given variable is of type Map

1
static Boolean types.isMap(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Map type, it returns True

isMapIterator

Checks whether the given variable is of type MapIterator

1
static Boolean types.isMapIterator(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a MapIterator type

isPromise

Checks whether the given variable is of type Promise

1
static Boolean types.isPromise(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Promise type, it returns True

isAsyncFunction

Checks whether the given variable is of type AsyncFunction

1
static Boolean types.isAsyncFunction(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is an AsyncFunction type, it returns True

isSet

Checks whether the given variable is of type Set

1
static Boolean types.isSet(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Set type, it returns True

isSetIterator

Checks whether the given variable is of type SetIterator

1
static Boolean types.isSetIterator(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a SetIterator type, it returns True

isTypedArray

Checks whether the given variable is of type TypedArray

1
static Boolean types.isTypedArray(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a TypedArray type, it returns True

isFloat32Array

Checks whether the given variable is of type Float32Array

1
static Boolean types.isFloat32Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Float32Array type, it returns True

isFloat64Array

Checks whether the given variable is of type Float64Array

1
static Boolean types.isFloat64Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a Float64Array type, it returns True

isInt8Array

Checks whether the given variable is of type Int8Array

1
static Boolean types.isInt8Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is of type Int8Array, it returns True

isInt16Array

Checks whether the given variable is of type Int16Array

1
static Boolean types.isInt16Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is an Int16Array type, it returns True

isInt32Array

Checks whether the given variable is of type Int32Array

1
static Boolean types.isInt32Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is of type Int32Array, it returns True

isUint8Array

Checks whether the given variable is of type Uint8Array

1
static Boolean types.isUint8Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is Uint8Array type

isUint8ClampedArray

Checks whether the given variable is of type Uint8ClampedArray

1
static Boolean types.isUint8ClampedArray(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is Uint8ClampedArray type

isUint16Array

Checks whether the given variable is of type Uint16Array

1
static Boolean types.isUint16Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is Uint16Array type

isUint32Array

Checks whether the given variable is of type Uint32Array

1
static Boolean types.isUint32Array(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is Uint32Array type

isFunction

Tests whether the given variable is a function object

1
static Boolean types.isFunction(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, returns True if it is a function object

isBuffer

Tests whether the given variable is a functionBufferobject

1
static Boolean types.isBuffer(Value v);

Call parameters:

  • v: Value, given the variable to be detected

Return results:

  • Boolean, if it is a functionBufferObject returns True
© Copyright 2012-2024 fibjs.org | Support us