Benchmark: object compare - MeasureThat.net

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/underscorejs/1.5.1/underscore-min.js"></script>
<script>window.underscore = _.noConflict()</script>
<script src="https://cdn.jsdelivr.net/lodash/3.10.1/lodash.min.js"></script>
<script>window.lodash = _.noConflict()</script>

Script Preparation code:

var base = {};
base.deepEquals = function(a, b) {
    if (typeof a != typeof b) {
        return false;
    }

    if (typeof a != "object") {
        return a == b;
    }

    if (a instanceof Array) {
        if (!(b instanceof Array)) {
            return false;
        }

        if (a.length != b.length) {
            return false;
        }

        for (var i = 0; i < a.length; i++) {
            if (!base.deepEquals(a[i], b[i])) {
                return false;
            }
        }

        return true;
    }

    var aKeyCount = 0;
    for (var key in a) {
        aKeyCount++;
        if (!(key in b)) {
            return false;
        }

        if (!base.deepEquals(a[key], b[key])) {
            return false;
        }
    }

    var bKeyCount = 0;
    for (var key in b) {
        if (!(key in a)) {
            return false;
        }
        bKeyCount++;
    }

    return aKeyCount == bKeyCount;
};

    Object.prototype.equals = function (x, deep) {
        if (deep) {
            if (x == this) return true;

            var p;
            for (p in this) {
                if (typeof (x[p]) == 'undefined') { return false; }
            }

            for (p in this) {
                if (this[p]) {
                    switch (typeof (this[p])) {
                        case 'object':
                            if (!this[p].equals(x[p])) { return false; } break;
                        case 'function':
                            if (typeof (x[p]) == 'undefined' ||
                      (p != 'equals' && this[p].toString() != x[p].toString()))
                                return false;
                            break;
                        default:
                            if (this[p] != x[p]) { return false; }
                    }
                } else {
                    if (x[p])
                        return false;
                }
            }

            for (p in x) {
                if (typeof (this[p]) == 'undefined') { return false; }
            }

            return true;
        }
        return x == this;
    }

base.stringifyEquals = function(a, b) {
    return JSON.stringify(a) === JSON.stringify(b);
};

a = {
   tableHeight: 50,
   topOffsets: [1, 2, 3, 4, 5]
};
b = {
   tableHeight: 50,
   topOffsets: [1, 2, 3, 4, 5]
};

Tests:

deepEquals
base.deepEquals(a, b)
stringifyEquals
base.stringifyEquals(a, b)
Object.prototype.equals
a.equals(b, true)
Lodash isEqual
lodash.isEqual(a,b)
underscore isequal
underscore.isEqual(a,b)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
deepEquals
stringifyEquals
Object.prototype.equals
Lodash isEqual
underscore isequal

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this benchmark.

**Benchmark Definition**
The benchmark definition consists of four test cases, each measuring the performance of a specific equality function:

1. `base.deepEquals(a, b)`
2. `base.stringifyEquals(a, b)`
3. `a.equals(b, true)` (using `Object.prototype.equals`)
4. `lodash.isEqual(a,b)` (using Lodash)
5. `underscore.isEqual(a,b)` (using Underscore)

**Options Compared**
Each test case compares the performance of a different equality function:

* `base.deepEquals` and `lodash.isEqual` and `underscore.isEqual` compare the depth of object equality, checking if two objects have the same properties with the same values.
* `base.stringifyEquals` compares the string representation of two objects using JSON.stringify.

**Pros and Cons**

1. **Depth of Object Equality**: `base.deepEquals`, `lodash.isEqual`, and `underscore.isEqual` use a recursive approach to compare the depth of object equality, which can lead to slower performance for large objects.
	* Pros: handles nested objects correctly
	* Cons: can be slow for very large objects
2. **String Representation**: `base.stringifyEquals` uses JSON.stringify to compare the string representation of two objects.
	* Pros: fast and simple approach
	* Cons: may not handle certain edge cases (e.g., cyclic references)

**Lodash and Underscore**
Both Lodash and Underscore provide optimized equality functions that are designed to be fast and efficient. However, their implementation details may differ, affecting the performance of the benchmark.

**Benchmark Results**
The latest benchmark results show the number of executions per second for each test case on a Mac OS X 10.15.6 machine running Chrome 85:

1. `Object.prototype.equals`: 1116419.625 exec/sec
2. `lodash.isEqual`: 1003513.1875 exec/sec
3. `underscore.isEqual`: 621719.9375 exec/sec
4. `stringifyEquals`: 380236.53125 exec/sec
5. `deepEquals`: 448270.46875 exec/sec

Overall, the results suggest that `Object.prototype.equals` is the fastest, followed by `lodash.isEqual`, and then `underscore.isEqual`. `stringifyEquals` is significantly slower due to its simple approach.

Keep in mind that these results are specific to this particular benchmark and may not generalize to other scenarios or environments.

Related benchmarks:

object compare (version: 0)

Comparing performance of: deepEquals vs stringifyEquals vs Object.prototype.equals vs Lodash isEqual vs underscore isequal

Created: 9 years ago by: Guest

Jump to the latest result

deepEquals

stringifyEquals

Object.prototype.equals

Lodash isEqual

underscore isequal

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):