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direct assignment vs push method
(version: 0)
123
Comparing performance of:
direct assignment vs push
Created:
5 years ago
by:
Guest
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Tests:
direct assignment
const arr = []; for(let i = 0; i < 100; i++) { arr[arr.length] = i; }
push
const arr = []; for(let i = 0; i < 100; i++) { arr.push(i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
direct assignment
push
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Android 14; Mobile; rv:134.0) Gecko/134.0 Firefox/134.0
Browser/OS:
Firefox Mobile 134 on Android
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<iframe src="https://measurethat.net/Embed?id=580752" width="100%" height="500px"></iframe>
direct assignment
2.7M/s
push
1.8M/s
View exact numbers
Test name
Executions per second
✓
direct assignment
2,667,428 Ops/sec
push
1,839,424 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Explanation** The provided benchmark measures the performance difference between two approaches for initializing an array in JavaScript: direct assignment using the `[]` syntax and pushing elements to the array using the `push()` method. **Approach Comparison** There are two main approaches compared: 1. **Direct Assignment**: This approach uses the square bracket notation (`[]`) to initialize an empty array. The `for` loop then appends elements to this array. 2. **Push Method**: This approach uses the `push()` method to add elements to an existing array, which is initially created with the `const arr = []` syntax. **Pros and Cons of Each Approach** * **Direct Assignment**: + Pros: Simple and concise syntax, potentially faster execution due to less overhead. + Cons: May not be as efficient as using the `push()` method, especially for larger arrays. * **Push Method**: + Pros: More explicit control over array operations, potentially more efficient for larger arrays. + Cons: Requires an initial array creation step, which may add overhead. **Library and Special JS Features** Neither of the benchmark tests uses a specific library or special JavaScript feature. The focus is on comparing the performance of two basic approach to array initialization in JavaScript. **Other Alternatives** If you were to write your own benchmark for this scenario, you could also consider using: 1. **Array.prototype.set()**: Introduced in ECMAScript 2015 (ES6), this method allows setting elements at a specific index in an array. 2. **Spread operator (`...`)**: Can be used to create a new array from an existing one or push elements onto it. For example: ```javascript const arr = []; for (let i = 0; i < 100; i++) { arr.set(i, i); } ``` or ```javascript const arr = [1, 2, 3]; arr.push(...Array(97).fill().map((_, i) => i + 4)); ``` Keep in mind that the performance differences between these approaches may be small and dependent on specific use cases.
Related benchmarks
Pushing items via Array.push vs. Spread Operator
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