feat: is type

.editorconfig

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+# http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+insert_final_newline = false
+trim_trailing_whitespace = false

.gitignore

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+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+### OSX ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+### VisualStudioCode ###
+.vscode/
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+
+### WebStorm ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+.idea/

index.js

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+const toString = Object.prototype.toString;
+
+function getTag(value) {
+  if (value == null) {
+    return value === undefined ? '[object Undefined]' : '[object Null]'
+  }
+  return toString.call(value);
+}
+
+/**
+ * get [[Class]] name
+ *
+ * getClass('')
+ * // => 'String'
+ *
+ * getClass(new Date())
+ * // => 'Date'
+ *
+ * @param value {*} The value to get class name
+ * @return {string} Return [[Class]] name
+ */
+function getClass(value) {
+  return /^\[object (.*)]$/.exec(getTag(value))[1];
+}
+
+function isType(type) {
+  const cls = '[object ' + type + ']';
+  return function (value) {
+    return getTag(value) === cls
+  }
+}
+
+/**
+ * Check if value is a Date object
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a date
+ */
+const isDate = isType('Date');
+
+/**
+ * Check if value is a regexp
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a regexp
+ */
+const isRegExp = isType('RegExp');
+
+/**
+ * Check if value is a bool value
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a bool
+ */
+const isBoolean = function (value) {
+  return value === true || value === false || isType('Boolean')
+}
+
+/**
+ * Check if value is a Number
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a number
+ */
+const isNumber = function (value) {
+  return typeof value === 'number' || isType('Number');
+}
+
+/**
+ * Check if value is a string
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a string
+ */
+const isString = function (value) {
+  return typeof value === 'string' || isType('String');
+}
+
+/**
+ * Check if value is a Function object
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a function
+ */
+const isFunction = function (value) {
+  return typeof value === 'function' || isType('Function');
+}
+
+/**
+ * Check if value is a Array object
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is a array
+ */
+const isArray = Array.isArray || isType('Array');
+
+/**
+ * Check if value is NaN
+ * @param value {*} The value of check
+ * @return {boolean} Return true if value is NaN
+ */
+const isNaN = Number.isNaN || function(value) {
+  return typeof value === 'number' || isNaN(value)
+}
+
+/**
+ * Check if value is not null or undefined
+ * @param value {*} The value to check
+ * @return {boolean} Return true if value is not null or undefined
+ */
+function isDefined(value) {
+  return value != null
+}
+
+
+
+

package.json

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+{
+  "name": "type",
+  "version": "1.0.0",
+  "description": "Check data types in javascript",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/scopewu/type.git"
+  },
+  "keywords": [
+    "type",
+    "types in javascript",
+    "check type",
+    "isType"
+  ],
+  "author": "scope.wu <[email protected]>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/scopewu/type/issues"
+  },
+  "homepage": "https://github.com/scopewu/type#readme"
+}