@coreui/react-pro/src/utils/isEqual.ts

UI Components Library for React.js

const isEqual = (a: any, b: any): boolean => {
  if (a === b) return true

  if (a && b && typeof a === 'object' && typeof b === 'object') {
    if (a.constructor !== b.constructor) return false

    let length: number, i: number | [any, any], keys: string[]
    if (Array.isArray(a)) {
      length = a.length
      if (length !== b.length) return false
      for (i = length; i-- !== 0; ) if (!isEqual(a[i], b[i])) return false
      return true
    }

    if (a instanceof Map && b instanceof Map) {
      if (a.size !== b.size) return false
      for (i of a.entries()) if (!b.has(i[0])) return false
      for (i of a.entries()) if (!isEqual(i[1], b.get(i[0]))) return false
      return true
    }

    if (a instanceof Set && b instanceof Set) {
      if (a.size !== b.size) return false
      for (i of a.entries()) if (!b.has(i[0])) return false
      return true
    }

    if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
      length = a.length
      if (length !== b.length) return false
      for (i = length; i-- !== 0; ) if (a[i] !== b[i]) return false
      return true
    }

    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags
    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf()
    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString()

    keys = Object.keys(a)
    length = keys.length
    if (length !== Object.keys(b).length) return false

    for (i = length; i-- !== 0; )
      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false

    for (i = length; i-- !== 0; ) {
      var key: string = keys[i]

      if (!isEqual(a[key], b[key])) return false
    }

    return true
  }

  return a !== a && b !== b
}

export default isEqual