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Spread vs. Ternary
(version: 0)
Compare the speed of spread vs. ternary conditional operator when copying an object.
Comparing performance of:
Spread vs Ternary
Created:
7 years ago
by:
Guest
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Tests:
Spread
const yay = {stuff: 1, otherStuff: true, maybeThis: {oohh: 'fuunnn', thisToo: 9001}, nope: null, ohWell: ""}; var whoo = {...yay};
Ternary
const yay = {stuff: 1, otherStuff: true, maybeThis: {oohh: 'fuunnn', thisToo: 9001}, nope: null, ohWell: ""}; var omg = yay ? yay : {};
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Suite status:
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Test case name
Result
Spread
Ternary
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! The provided benchmark compares two approaches to copy an object: the spread operator (`...`) and the ternary conditional operator (`yay ? yay : {}`). **Spread Operator (Spread)** The spread operator is used to create a new array or object by spreading the elements of an existing array or object. In this case, it's used to create a shallow copy of the `yay` object. ```javascript var whoo = {...yay}; ``` Pros: * Easy to read and write * Fast and efficient * Works with both arrays and objects Cons: * Can be slower than other methods for very large datasets * May not work correctly if the original object has circular references (more on this later) **Ternary Conditional Operator** The ternary conditional operator is a shorthand way to write simple conditional statements. In this case, it's used to create a new object that is either `yay` or an empty object, depending on whether `yay` is truthy. ```javascript var omg = yay ? yay : {}; ``` Pros: * Can be faster than the spread operator for very large datasets * Works correctly even if the original object has circular references Cons: * Less readable and maintainable than the spread operator * Requires careful handling of edge cases (e.g., what happens when `yay` is null or undefined?) **Circular References** When working with objects, it's common to encounter circular references, where an object references itself directly or indirectly. In the spread operator approach, if the original object has a circular reference, the new object will also inherit this reference, which can lead to unexpected behavior. The ternary conditional operator avoids this issue by creating a new empty object that doesn't contain any references, even if the original object does. **Library and Purpose** In this benchmark, there is no explicit library being used. The `yay` object is defined directly in the benchmark script. However, it's worth noting that the spread operator was introduced in ECMAScript 2015 (ES6) and has been widely adopted as a standard feature of JavaScript. If you're working with older versions of JavaScript or need to support them, you may need to use alternative methods, such as `Object.assign()`. **Other Alternatives** In addition to the spread operator and ternary conditional operator, there are other ways to copy an object in JavaScript: * `Object.assign()`: This method creates a new object with the properties of another object. It's generally slower than the spread operator but provides more control over the copying process. * `JSON.parse(JSON.stringify(obj))`: This method uses JSON serialization to create a deep copy of an object. However, it may not work correctly for objects that contain functions or other non-serializable values. * `Lodash's `cloneDeep()` function**: If you're working with Lodash (a popular JavaScript utility library), you can use the `cloneDeep()` function to create a deep copy of an object. In summary, the spread operator and ternary conditional operator are both fast and efficient ways to copy objects in JavaScript. The choice between them depends on the specific requirements of your project and whether you need to handle circular references or edge cases.
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