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for-in vs object.keys (3)
(version: 0)
Comparing performance of:
for-in vs Object.keys
Created:
4 years ago
by:
Guest
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Script Preparation code:
var obj = { quitMin: 'mod+q', addTab: 'mod+t', addPrivateTab: 'shift+mod+n', duplicateTab: 'shift+mod+d', addTask: 'mod+n', toggleTasks: 'shift+mod+e', goBack: 'mod+left', goForward: 'mod+right', enterEditMode: ['mod+l', 'mod+k'], runShortcut: 'mod+e', completeSearchbar: 'mod+enter', closeTab: 'mod+w', restoreTab: 'shift+mod+t', gotoFirstTab: 'shift+mod+9', gotoLastTab: 'mod+9', addToFavorites: 'mod+d', showBookmarks: 'shift+mod+b', toggleReaderView: 'shift+mod+r', switchToNextTab: ['option+mod+right', 'ctrl+tab', 'shift+mod+pagedown'], switchToPreviousTab: ['option+mod+left', 'shift+ctrl+tab', 'shift+mod+pageup'], moveTabLeft: 'option+mod+shift+left', moveTabRight: 'option+mod+shift+right', switchToNextTask: 'mod+]', switchToPreviousTask: 'mod+[', closeAllTabs: 'shift+mod+w', reload: ['mod+r', 'f5'], reloadIgnoringCache: 'mod+f5', showMenu: 'ctrl+m', followLink: 'mod+enter', fillPassword: 'mod+\\', toggleTabAudio: 'shift+mod+m', showHistory: 'shift+mod+h' };
Tests:
for-in
for (var i=100; i > 0; i--) { for (var key in obj) { console.log(key); } }
Object.keys
for (var i=100; i > 0; i--) { const arr = Object.keys(obj) for(const key of arr) { console.log(key) } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for-in
Object.keys
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
To understand what is being tested in this benchmark, let's break down the individual test cases and the options being compared. **Option 1: for-in loop** The first test case uses a traditional `for-in` loop to iterate over the properties of an object. This approach is often considered outdated and less efficient than other methods. **Option 2: Object.keys() method** The second test case uses the `Object.keys()` method to get an array of the object's property names, which can then be iterated over using a `for...of` loop. Now, let's discuss the pros and cons of each approach: **For-in loop:** Pros: * Easy to understand and implement for beginners * Can work with legacy codebases that use this syntax Cons: * Less efficient than other methods, especially for large objects * May have performance issues due to the overhead of iterating over property names * Can be sensitive to object structure changes (e.g., adding or removing properties) **Object.keys() method:** Pros: * More efficient and modern approach to iterating over object properties * Less prone to performance issues compared to for-in loops * Easier to understand and implement for developers familiar with array methods Cons: * Requires a modern JavaScript environment that supports `Object.keys()` * May not work as expected if the object has non-enumerable properties (depending on the browser) **Other considerations:** * **Browser support:** Both options should work in most modern browsers, but older browsers might have issues with the `Object.keys()` method. * **Object structure changes:** If the object's structure is changed, either option may break. However, `Object.keys()` is less likely to be affected due to its focus on property names rather than iteration order. **Library usage:** There are no libraries being used in these test cases, so there is nothing to report on this front. **Special JS features or syntax:** * The `for...of` loop introduced in ECMAScript 2015 (ES6) is not explicitly mentioned, but it's implied as a replacement for traditional `for` loops. If the code uses any newer JavaScript features, they are not mentioned. * There are no explicit mentions of any special JavaScript features or syntax being used. **Alternatives:** Other alternatives to these two options could include: * Using `Object.entries()` method (introduced in ECMAScript 2015) to get an array of property names and values * Utilizing libraries like Lodash, which provides a `keys` function for iterating over object properties * Implementing custom iteration logic using `Array.prototype.forEach()` or other methods Please note that the choice of alternative approaches depends on the specific requirements and constraints of the project.
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