Run results for: Lodash isEqual vs fast-is-equal vs JSON.stringify vs fast-deep-equal

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser: Chrome 139

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
_.isEqual Level 1	3744142.0 Ops/sec
deepEquals Level 1	75360208.0 Ops/sec
JSON.stringify Level 1	5775097.5 Ops/sec
fast-deep-equal Level 1	5094684.0 Ops/sec
_.isEqual Level 2	1788305.2 Ops/sec
deepEquals Level 2	21278146.0 Ops/sec
JSON.stringify Level 2	5785858.0 Ops/sec
fast-deep-equal Level 2	5944562.5 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
<script>
  // https://github.com/epoberezkin/fast-deep-equal
  // https://cdn.jsdelivr.net/npm/fast-deep-equal@3.1.3
  function fastDeepEquals(t, e) {
    if (t === e) 
      return !0;
    
    if (t && e && "object" == typeof t && "object" == typeof e) {
      if (t.constructor !== e.constructor) 
        return !1;
      
      var o,
        n,
        u;
      if (Array.isArray(t)) {
        if ((o = t.length) != e.length) 
          return !1;
        
        for (n = o; 0 != n--;) 
          if (! fastDeepEquals(t[n], e[n])) 
            return !1;
          
        
        return !0
      }
      if (t.constructor === RegExp) 
        return t.source === e.source && t.flags === e.flags;
      
      if (t.valueOf !== Object.prototype.valueOf) 
        return t.valueOf() === e.valueOf();
      
      if (t.toString !== Object.prototype.toString) 
        return t.toString() === e.toString();
      
      if ((o =( u = Object.keys(t)).length) !== Object.keys(e).length) 
        return !1;
      
      for (n = o; 0 != n--;) 
        if (!Object
            .prototype
            .hasOwnProperty
            .call(e, u[n])) 
          return !1;
        
      
      for (n = o; 0 != n--;) {
        var f = u[n];
        if (! fastDeepEquals(t[f], e[f])) 
          return !1
        
      }
      return !0
    }
    return t != t && e != e
  }
  // https://github.com/JairajJangle/fast-is-equal
  // https://cdn.jsdelivr.net/npm/fast-is-equal@1.2.3
  const TYPEOF_OBJECT = "object",
    TYPEOF_FUNCTION = "function",
    TYPEOF_NUMBER = "number",
    TYPEOF_STRING = "string",
    TYPEOF_BOOLEAN = "boolean",
    TYPEOF_SYMBOL = "symbol",
    TYPEOF_BIGINT = "bigint",
    isNaN = Number.isNaN,
    dateConstructor = Date,
    regExpConstructor = RegExp,
    mapConstructor = Map,
    setConstructor = Set,
    arrayBufferConstructor = ArrayBuffer,
    promiseConstructor = Promise,
    errorConstructor = Error,
    dataViewConstructor = DataView;
  function fastIsEqual(t, r) {
    if (t === r) 
      return !0;
    
    if (null == t || null == r) 
      return !1;
    
    const e = typeof t;
    if ("number" === e) 
      return "number" == typeof r && isNaN(t) && isNaN(r);
    
    if ("string" === e || "boolean" === e || "function" === e || "symbol" === e || "bigint" === e) 
      return !1;
    
    if ("object" != typeof r) 
      return !1;
    
    const n = Array.isArray(t);
    if (n !== Array.isArray(r)) 
      return !1;
    
    const o = t.constructor;
    if (o !== r.constructor) 
      return !1;
    
    if (n) {
      const e = t.length;
      if (e !== r.length) 
        return !1;
      
      if (0 === e) 
        return !0;
      
      if (e < 8) {
        for (let n = 0; n < e; n++) {
          const e = n in t;
          if (e !== n in r) 
            return !1;
          
          if (! e) 
            continue;
          
          const o = t[n],
            i = r[n];
          if (o === i) 
            continue;
          
          if (null == o || null == i) 
            return !1;
          
          const f = typeof o;
          if (f !== typeof i) 
            return !1;
          
          if ("number" !== f) {
            if ("object" !== f && "function" !== f) 
              return !1;
            
            if (!deepEqual(o, i, new Map)) 
              return !1
            
          } else if (! isNaN(o) || ! isNaN(i)) 
            return !1
          
        }
        return !0
      }
      return deepEqual(t, r, new Map)
    }
    return o === dateConstructor
      ? t.getTime() === r.getTime()
      : o === regExpConstructor
        ? t.source === r.source && t.flags === r.flags
        : deepEqual(t, r, new Map)
  }
  function deepEqual(t, r, e) {
    if (t === r) 
      return !0;
    
    if (null == t || null == r) 
      return !1;
    
    const n = typeof t;
    if (n !== typeof r) 
      return !1;
    
    if ("number" === n) 
      return isNaN(t) && isNaN(r);
    
    if ("object" !== n && "function" !== n) 
      return !1;
    
    const o = e.get(t);
    if (void 0 !== o) 
      return o === r;
    
    if (e.has(r)) 
      return !1;
    
    const i = t.constructor;
    if (i !== r.constructor) 
      return !1;
    
    if (i === dateConstructor) 
      return t.getTime() === r.getTime();
    
    if (i === regExpConstructor) 
      return t.source === r.source && t.flags === r.flags;
    
    if (i === promiseConstructor || i === errorConstructor) 
      return !1;
    
    if (Array.isArray(t)) {
      const n = t.length;
      if (n !== r.length) 
        return !1;
      
      if (e.set(t, r), e.set(r, t), 0 === n) 
        return !0;
      
      for (let o = 0; o < n; o++) {
        const n = o in t;
        if (n !== o in r) 
          return !1;
        
        if (! n) 
          continue;
        
        const i = t[o],
          f = r[o];
        if (i !== f && ! deepEqual(i, f, e)) 
          return !1
        
      }
      return !0
    }
    if (i === mapConstructor) {
      const n = t,
        o = r;
      if (n.size !== o.size) 
        return !1;
      
      if (0 === n.size) 
        return !0;
      
      e.set(t, r),
      e.set(r, t);
      for (const [t, r] of n) {
        const n = typeof t;
        if ("object" !== n && "function" !== n) {
          if (! o.has(t)) 
            return !1;
          
          const n = o.get(t);
          if (r !== n && ! deepEqual(r, n, e)) 
            return !1
          
        } else {
          let n = !1;
          for (const [i, f] of o) 
            if (deepEqual(t, i, e) && deepEqual(r, f, e)) {
              n = !0;
              break
            }
          
          if (! n) 
            return !1
          
        }
      }
      return !0
    }
    if (i === setConstructor) {
      const n = t,
        o = r;
      if (n.size !== o.size) 
        return !1;
      
      if (0 === n.size) 
        return !0;
      
      e.set(t, r),
      e.set(r, t);
      let i = !1,
        f = !1;
      for (const t of n) {
        const r = typeof t;
        if ("object" === r || "function" === r) 
          f = !0;
         else if (i =! 0, ! o.has(t)) 
          return !1
        
      }
      if (! f) 
        return !0;
      
      const u = [],
        s = [];
      for (const t of n) {
        const r = typeof t;
        "object" !== r && "function" !== r || u.push(t)
      }
      for (const t of o) {
        const r = typeof t;
        "object" !== r && "function" !== r || s.push(t)
      }
      const c = new Uint8Array(s.length);
      for (const t of u) {
        let r = !1;
        for (let n = 0; n < s.length; n++) 
          if (! c[n]) {
            const o = new Map(e);
            if (deepEqual(t, s[n], o)) {
              c[n] = 1,
              r = !0;
              break
            }
          }
        
        if (! r) 
          return !1
        
      }
      return !0
    }
    if (i === arrayBufferConstructor) {
      const e = t,
        n = r,
        o = e.byteLength;
      if (o !== n.byteLength) 
        return !1;
      
      const i = new Uint8Array(e),
        f = new Uint8Array(n);
      let u = 0;
      const s = o - 7;
      for (; u < s; u += 8) 
        if (i[u] !== f[u] || i[u + 1] !== f[u + 1] || i[u + 2] !== f[u + 2] || i[u + 3] !== f[u + 3] || i[u + 4] !== f[u + 4] || i[u + 5] !== f[u + 5] || i[u + 6] !== f[u + 6] || i[u + 7] !== f[u + 7]) 
          return !1;
        
      
      for (; u < o; u++) 
        if (i[u] !== f[u]) 
          return !1;
        
      
      return !0
    }
    if (i === dataViewConstructor) {
      const e = t,
        n = r;
      if (e.byteLength !== n.byteLength || e.byteOffset !== n.byteOffset) 
        return !1;
      
      for (let t = 0; t < e.byteLength; t++) 
        if (e.getUint8(t) !== n.getUint8(t)) 
          return !1;
        
      
      return !0
    }
    if (ArrayBuffer.isView(t)) {
      if (t.constructor !== r.constructor) 
        return !1;
      
      const e = t,
        n = r,
        o = e.length;
      if (o !== n.length) 
        return !1;
      
      if (o < 16) {
        for (let t = 0; t < o; t++) 
          if (e[t] !== n[t]) 
            return !1;
          
        
        return !0
      }
      let i = 0;
      const f = o - 3;
      for (; i < f; i += 4) 
        if (e[i] !== n[i] || e[i + 1] !== n[i + 1] || e[i + 2] !== n[i + 2] || e[i + 3] !== n[i + 3]) 
          return !1;
        
      
      for (; i < o; i++) 
        if (e[i] !== n[i]) 
          return !1;
        
      
      return !0
    }
    e.set(t, r),
    e.set(r, t);
    const f = Object.keys(t),
      u = f.length;
    if (u !== Object.keys(r).length) 
      return !1;
    
    if (0 === u) {
      if (void 0 !== Object.getOwnPropertySymbols) {
        const n = Object.getOwnPropertySymbols(t);
        if (n.length !== Object.getOwnPropertySymbols(r).length) 
          return !1;
        
        for (let o = 0; o < n.length; o++) {
          const i = n[o];
          if (!(i in r) || ! deepEqual(t[i], r[i], e)) 
            return !1
          
        }
      }
      return !0
    }
    for (let n = 0; n < u; n++) {
      const o = f[n];
      if (!(o in r)) 
        return !1;
      
      const i = t[o],
        u = r[o];
      if (i !== u) {
        const t = typeof i;
        if ("object" === t || "function" === t) {
          if (! deepEqual(i, u, e)) 
            return !1
          
        } else {
          if ("number" !== t) 
            return !1;
          
          if (! isNaN(i) || ! isNaN(u)) 
            return !1
          
        }
      }
    }
    if (void 0 !== Object.getOwnPropertySymbols) {
      const n = Object.getOwnPropertySymbols(t);
      if (n.length > 0) {
        if (n.length !== Object.getOwnPropertySymbols(r).length) 
          return !1;
        
        for (let o = 0; o < n.length; o++) {
          const i = n[o];
          if (!(i in r) || ! deepEqual(t[i], r[i], e)) 
            return !1
          
        }
      }
    }
    return !0
  }
</script>

Script Preparation code:

// 1 level deep
window.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };

// 2 levels deep
window.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };

// 3 levels deep
window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

Tests:

_.isEqual Level 1
_.isEqual(window.foo1, window.bar1)
fast-is-equal Level 1
fastIsEqual(window.foo1, window.bar1);
JSON.stringify Level 1
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);
fast-deep-equal Level 1
fastDeepEquals(window.foo1, window.bar1);
_.isEqual Level 2
_.isEqual(window.foo2, window.bar2)
fast-is-equal Level 2
fastIsEqual(window.foo2, window.bar2);
JSON.stringify Level 2
JSON.stringify(window.foo2) === JSON.stringify(window.bar2);
fast-deep-equal Level 2
fastDeepEquals(window.foo2, window.bar2);
_.isEqual Level 3
_.isEqual(window.foo3, window.bar3)
fast-is-equal Level 3
fastIsEqual(window.foo3, window.bar3);
JSON.stringify Level 3
JSON.stringify(window.foo3) === JSON.stringify(window.bar3);
fast-deep-equal Level 3
fastDeepEquals(window.foo3, window.bar3);

Run results for: Lodash isEqual vs fast-is-equal vs JSON.stringify vs fast-deep-equal

_.isEqual Level 1

fast-is-equal Level 1

JSON.stringify Level 1

fast-deep-equal Level 1

_.isEqual Level 2

fast-is-equal Level 2

JSON.stringify Level 2

fast-deep-equal Level 2

_.isEqual Level 3

fast-is-equal Level 3

JSON.stringify Level 3

fast-deep-equal Level 3