tyro-util/lib/equals.js

前端常用工具库

/**
 * @desc   全等判断(在两个变量之间进行深度比较以确定它们是否全等)
 * @param  {} a
 * @param  {} b
 * @return {Boolean}
 *
 * eg.
 * equals({ a: [2, { e: 3 }], b: [4], c: 'foo' }, { a: [2, { e: 3 }], b: [4], c: 'foo' }); // true
 */
const equals = (a, b) => {
  if (a === b) return true
  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime()
  if (!a || !b || (typeof a !== 'object' && typeof b !== 'object'))
    return a === b
  if (a.prototype !== b.prototype) return false
  let keys = Object.keys(a)
  if (keys.length !== Object.keys(b).length) return false
  return keys.every(k => equals(a[k], b[k]))
}

module.exports = equals