<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
function getRandomInt(max) {
return Math.floor(Math.random() * Math.floor(max));
}
var arr = [];
for(var i = 0; i < 5000; i++){
arr.push({value:getRandomInt(100)});
}
_.isArray(arr);
Array.isArray(arr)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
lodash isArray | |
Array isArray |
Test name | Executions per second |
---|---|
lodash isArray | 94534728.0 Ops/sec |
Array isArray | 407615.4 Ops/sec |
Let's break down the provided benchmark and its options.
Benchmark Overview
The benchmark tests the performance of two approaches to check if an array is an array:
_.isArray(arr);
)Array.isArray()
method (Array.isArray(...arr)
)Lodash Approach (_.isArray(arr);
)
_.isArray()
method uses a cached version of the function, which can improve performance by reusing the same cache for subsequent calls. However, this comes at the cost of requiring Lodash.Native Approach (Array.isArray(...arr)
)
Comparison
The benchmark is designed to compare the performance of these two approaches. The test case _.isArray(arr);
uses Lodash's implementation, while Array.isArray(...arr)
uses the native method. By comparing the execution times and number of executions per second, we can see which approach is faster and more efficient.
Other Alternatives
If you need to check if an object is an array, but don't want to use Lodash or the native Array.isArray()
method, you could consider:
typeof
operator (e.g., if (obj instanceof Array) { ... }
)However, these alternatives might not be as efficient or reliable as the Lodash and native approaches.
Conclusion
The benchmark highlights the importance of performance and optimization in JavaScript development. By using a library like Lodash, you can achieve faster execution times for common operations. However, this comes at the cost of adding additional dependencies and overhead. The native Array.isArray()
method provides a lightweight alternative, but may not be as efficient. Ultimately, the choice depends on your specific use case, performance requirements, and personal preference.