lodash.ts

/**
 * 判断书叫是否为 null 或 undefined
 *
 * like lodash/isNil
 *
 * @param value - 未知数据
 */
export function isNil(value: unknown): value is undefined | null {
  return value === undefined || value === null
}

/**
 * 如果值为 null 或 undefined，则使用默认值
 *
 * like lodash/defaultTo
 *
 * @param value - 未知数据
 * @param defaultValue - 默认值
 */
export function defaultTo<T>(value: T | undefined | null, defaultValue: T): T {
  return isNil(value) ? defaultValue : value
}

/**
 * 获取值
 *
 * like lodash/get
 *
 * @param object - 对象
 * @param value - 未知数据
 */
export function get<T extends Record<string, unknown>, K extends keyof T>(
  object: T,
  path: K
): Exclude<T[K], undefined>

/**
 * 获取值
 *
 * like lodash/get
 *
 * @param object - 对象
 * @param value - 未知数据
 * @param defaultValue - 默认值
 */
export function get<T extends Record<string, unknown>, K extends keyof T, D>(
  object: T,
  path: K,
  defaultValue: D
): Exclude<T[K], undefined>

/**
 * 获取值
 *
 * like lodash/get
 *
 * @param object - 对象
 * @param value - 未知数据
 * @param defaultValue - 默认值
 */
export function get<T extends Record<string, unknown>, K extends keyof T, D>(
  object: T,
  path: K,
  defaultValue?: D
): Exclude<T[K], undefined> | D | undefined {
  return defaultTo(object[path] as D, defaultValue)
}