<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>
var values = [{a: 30310}, {b: 100303}, {c: 3040494}]
var count = 0;
_.forEach(values, function(v,i) {
if (v.a != null) {
count++;
}
})
var count = 0;
const len = values.length
for (var i = 0; i < len; i++) {
if (values[i].a != null) {
count++;
}
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
lodash.forEach | |
native |
Test name | Executions per second |
---|---|
lodash.forEach | 2197987.2 Ops/sec |
native | 2244024.0 Ops/sec |
Let's break down the provided benchmark and its test cases.
Benchmark Definition
The benchmark measures the performance of two approaches to iterate over an array: using _.forEach
from Lodash (a utility library) versus a traditional for
loop with index iteration (i
).
Options Compared
Two options are compared:
_.forEach
: This approach uses the forEach
function from Lodash, which is a higher-order function that iterates over an array and calls a callback function for each element.for
loop with index iteration (i
): This approach uses a traditional for
loop to iterate over the array, where the variable i
represents the index of each element.Pros and Cons
Lodash _.forEach
Pros:
Cons:
Traditional for
loop with index iteration (i
)
Pros:
Cons:
Library: Lodash
Lodash is a utility library that provides a collection of functional programming helpers, including forEach
. Its purpose is to simplify common tasks and make code more concise and readable. In this benchmark, Lodash's forEach
function is used as the iteration approach.
Special JavaScript Feature/Syntax
None are explicitly mentioned in the provided benchmark definition. However, it's worth noting that the use of Lodash introduces a subtle dependency on this library, which may affect the overall test results.
Other Alternatives
If you were to modify or extend this benchmark, some alternative options to consider:
Array.prototype.forEach
(instead of Lodash's _.forEach
)map
, filter
, or reduce
Keep in mind that each alternative may introduce new challenges and considerations, so be sure to carefully evaluate the trade-offs when modifying the benchmark.