JS常用类型检验函数方法

判断类型方法

最近在项目中需要对一些运行时的值进行类型检查,以确保传入函数的参数是正确的类型。这里提供了几种类型检查的方法。

export function isNumber<T extends number>(value: T | unknown): value is number {
  return Object.prototype.toString.call(value) === '[object Number]'
}

export function isString<T extends string>(value: T | unknown): value is string {
  return Object.prototype.toString.call(value) === '[object String]'
}

export function isBoolean<T extends boolean>(value: T | unknown): value is boolean {
  return Object.prototype.toString.call(value) === '[object Boolean]'
}

export function isNull<T extends null>(value: T | unknown): value is null {
  return Object.prototype.toString.call(value) === '[object Null]'
}

export function isUndefined<T extends undefined>(value: T | unknown): value is undefined {
  return Object.prototype.toString.call(value) === '[object Undefined]'
}

export function isObject<T extends object>(value: T | unknown): value is object {
  return Object.prototype.toString.call(value) === '[object Object]'
}

export function isArray<T extends any[]>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Array]'
}

export function isFunction<T extends (...args: any[]) => any | void | never>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Function]'
}

export function isDate<T extends Date>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Date]'
}

export function isRegExp<T extends RegExp>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object RegExp]'
}

export function isPromise<T extends Promise<any>>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Promise]'
}

export function isSet<T extends Set<any>>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Set]'
}

export function isMap<T extends Map<any, any>>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object Map]'
}

export function isFile<T extends File>(value: T | unknown): value is T {
  return Object.prototype.toString.call(value) === '[object File]'
}