Deep compare two objects/values and return true if one is a clone of other
1. Install
npm install iscloneconst isClone = require('isClone')
//Primitive types
isClone(null, undefined) // FALSE
isClone(undefined, undefined) // TRUE
isClone(null, null) // TRUE
isClone(3/0, 3/0) // TRUE
isClone(+"xpto", +"1 + 2") // TRUE
isClone(3, 4) // FALSE
isClone(3, 3) // TRUE
isClone('abc', 'abc') // TRUE
isClone('abc', '') // FALSE
//Primitive types and builtin objects
isClone(3, new Number(3)) // FALSE
isClone(BigInt(321), 321n) // TRUE
isClone(3, '3') // FALSE
isClone(3, new Number(3)) // FALSE
isClone(new String('ab'), new String('ab')) // TRUE
isClone(new String('ab'), 'ab') // FALSE
isClone(new Boolean(true), new Boolean(true)) // TRUE
isClone(true, true) // TRUE
const now = new Date
isClone(now, new Date(now)) // TRUE
isClone(now, new Date('December 17, 1995 03:24:00')) // FALSE
const re = /^$/imsg
isClone(re, new RegExp(re)) // TRUE
isClone(/^$/igsm, /^$/sgmi) // TRUE
isClone(/^$/igsm, /^$/im) // FALSE
isClone(/^.$/, /^$/) // FALSE
//Arays and binary arrays
isClone([3, 2], [3, 2]) // TRUE
isClone([3, 2], [3, 2, 1]) // FALSE
isClone(new Int8Array([3, -3]), new Int8Array([3, -3])) // TRUE
isClone(new Int8Array([3, -3]), new Int8Array([3, -3, 4])) // FALSE
isClone(new BigInt64Array([3n, -3n]), new BigInt64Array([3n, -3n])) // TRUE
isClone(new BigInt64Array([3n, -3n]), new BigInt64Array([3n, 0n])) // FALSE
isClone(new Float64Array([Math.PI, Math.E, 1/3, Math.sqrt(2)]), new Float64Array([Math.PI, Math.E, 1/3, Math.sqrt(2)])) // TRUE
// Functions (by default two function are equal if and only if they both refere to same code/object)
const f = function() {}
const g = function() {}
isClone(f, g) // FALSE
isClone(f, g, {strictly: false}) // TRUE
//Literal Objects
const x = { i: 1 }
const y = { i: 1 }
isClone(x, y) // TRUE
//Nest Objects
const z = { a: x }
const w = { a: y }
isClone(z, w) // TRUE
//Object members
w.f = () => {}
isClone(z, w) // FALSE
//User defined Objects
function A (i) { this.i = i }
function B (i) { this.i = i }
isClone(A, B) // FALSE
const a = new A(3)
isClone(a, new A(3)) // TRUE
isClone(a, new A(4)) // FALSE
const b = new B(3)
isClone(a, b) // FALSE
//Sets
const s = new Set([x, a])
isClone(s, new Set(s)) // TRUE
isClone(s, new Set([x, a])) // TRUE
isClone(s, new Set([x, b])) // FALSE
//Maps
const m = new Map([[x, a], [y, a]])
isClone(m, new Map(m)) // TRUE
isClone(m, new Map([[x, a], [y, a]])) // TRUE
isClone(m, new Map([[x, a], [y, b]])) // FALSE
// Class instances
class C{}
isClone(C, A) // FALSE
const c = new C()
isClone(c, new C()) // TRUE
// Inheritance
class D extends C {}
isClone(D, C) // FALSE
const d = new D()
isClone(d, c) // FALSE
isClone(d, new D()) // TRUE
// Changing an instance property
class E{
constructor (i) { this.i = i }
inc() { this.i++ }
}
const e = new E(0)
isClone(e, new E(0)) // TRUE
e.inc = function(){}
isClone(e, new E(0)) // FALSE
// Nested objects
class DE{
constructor (i) { this.e = new E(i) }
}
const de = new DE(0)
isClone(de, new DE(0)) // TRUE
isClone(new DE(c), new DE(c)) // TRUE
isClone(new DE(de), new DE(de)) // TRUE
isClone(new DE(m), new DE(m)) // TRUE
de.x = 'x'
isClone(de, new DE(0)) // FALSE
// Circular references
x.i = x
y.i = x
isClone(x, y) // TRUE
x.i = x
y.i = y
isClone(x, y) // TRUE
x.i = y
y.i = x
isClone(x, y) // TRUE
// Subclasses of builtin types
const abc = new String('abc')
class STR extends String{
constructor(s) {super(s)}
}
isClone(new STR('abc'), new STR('abc')) // TRUE
isClone(new STR('abc'), abc) // FALSE
abc.label = 'label'
isClone(abc, new String('abc')) // FALSE
const one = new Number(1)
one.label = 'label'
isClone(one, new Number(1)) // FALSE
const bool = new Boolean(true)
bool.label = 'label'
isClone(bool, new Boolean(true)) // FALSE
const d1st = new Date('December 1, 1995 00:00:00')
isClone(d1st, new Date('December 1, 1995 00:00:00')) // TRUE
d1st.label = 'label'
isClone(d1st, new Date('December 1, 1995 00:00:00')) // FALSE
const regexp = /^.+$/imsg
isClone(regexp, /^.+$/imsg) // TRUE
regexp.label = 'label'
isClone(regexp, /^.+$/imsg) // FALSE
const array = [1, 2]
isClone(array, [1, 2]) // TRUE
array.label = 'label'
isClone(array, [1, 2]) // FALSE
class Vector extends Array{
constructor(s) {super(s)}
}
isClone(new Vector(3), new Vector(3)) // TRUE
isClone(new Vector(3), new Array(3)) // FALSE
const set = new Set([1, 2])
isClone(set, new Set([1, 2])) // TRUE
set.label = 'label'
isClone(set, new Set([1, 2])) // FALSE
const map = new Map([[1, 2], [2,3]])
isClone(map, new Map([[1, 2], [2,3]])) // TRUE
map.label = 'label'
isClone(map, new Map([[1, 2], [2,3]])) // FALSE
// Prototype inheritance
function A(n = 1) { this.n = n }
A.prototype.inc = function(n) { this.n += n }
const obja = new A(1)
isClone(obja, new A(1)) // TRUE
isClone(obja, new A(2)) // FALSE
function B(n = 1) { A.call(this, n) }
isClone(obja, new B(1)) // FALSE
B.prototype = Object.create(A.prototype)
isClone(obja, new B(1)) // FALSE
B.prototype.dec = function(n) { this.inc(-n); }
B.prototype.constructor = B
isClone(A, B) // FALSE
const objb = new B(1)
isClone(objb, new B(1)) // TRUE
isClone(objb, obja) // FALSE
objb.inc = () => {}
isClone(objb, new B(1)) // FALSE