Benchmark: Ember.isNone vs hasownproperty

Script Preparation code:

var a = {'a': 1, 'b': 2};
for(var i = 4; i < 1000000; i++){
    a[i] = i;
}
function isNone(obj) {
  return obj === null || obj === undefined;
}

Tests:

isNone
isNone(a['c']);
hasOwnProperty
a.hasOwnProperty('c')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isNone
hasOwnProperty

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested.

**Benchmark Definition:**

The benchmark consists of two test cases:

1. `isNone(a['c'])`
2. `a.hasOwnProperty('c')`

Both test cases are measuring the performance difference between using `===` for a null check (`isNone`) versus using the `hasOwnProperty()` method for property existence checking.

**Script Preparation Code:**

The script preparation code creates an object `a` with 1 million properties, starting from index 4 up to 1000000. This is done to force the browser to iterate over a large array of objects and make a decision about null/undefined values.

```javascript
var a = {'a': 1, 'b': 2};\r\nfor(var i = 4; i < 1000000; i++){\r\n    a[i] = i;\r\n}\r\nfunction isNone(obj) {\r\n  return obj === null || obj === undefined;\r\n}
```

The purpose of this setup is to create a scenario where the browser has to frequently access `a['c']` and make decisions about its value being null or not. This simulates the use case where someone might be trying to check if a property exists or not.

**Library: None**

There isn't any explicit library used in this benchmark definition. The only functionality used is built-in JavaScript methods, namely `===`, `hasOwnProperty()`, and array iteration.

However, it's worth noting that some browsers may have additional features or optimizations enabled by default for certain properties or objects, which might affect the results of this benchmark.

**Special JS Features/Syntax: None**

There are no special JavaScript features or syntaxes being tested in this benchmark definition.

**Other Alternatives:**

In a similar scenario, you could create a benchmark to compare:

* Using `in` operator instead of `hasOwnProperty()`
* Using `Object.prototype.hasOwnProperty.call()` instead of `hasOwnProperty()`
* Using a library like Lodash's `isPlainObject()` or `isObject()` for property existence checking
* Using a framework like Ember.js's own `isEmpty()` method

Keep in mind that each alternative would likely introduce different factors affecting the results, such as the presence of additional libraries, specific browser features, or optimization differences.

For example:

```javascript
// Using `in` operator
function isNone(a['c']) {
  return !a.hasOwnProperty('c');
}

// Using Object.prototype.hasOwnProperty.call()
function isNone(a['c']) {
  return a.hasOwnProperty('c') && typeof a[c] !== 'undefined';
}
```

Each of these alternatives would require careful consideration and experimentation to ensure accurate benchmarking results.

Related benchmarks:

Ember.isNone vs hasownproperty (version: 0)

Comparing performance of: isNone vs hasOwnProperty

Created: 6 years ago by: Guest

Jump to the latest result

isNone

hasOwnProperty

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):