<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
var MyObject = {
description: 'Creates a deep copy of source, which should be an object or an array.',
myNumber: 123456789,
myBoolean: true,
jayson: {
stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
parse: 'JSON.parse() method parses a JSON string...',
more: {
less: {
msg: 'Benis'
}
}
},
penis: 'Benis'
};
const clone = _.cloneDeep(MyObject)
const clone = JSON.parse(JSON.stringify(MyObject))
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
lodash clone | |
Json parse stringify |
Test name | Executions per second |
---|---|
lodash clone | 349790.5 Ops/sec |
Json parse stringify | 334347.4 Ops/sec |
I'll break down the benchmarking test cases and explain what's being tested, the pros and cons of each approach, and other considerations.
Benchmark Definition
The provided JSON represents a JavaScript microbenchmark test case. It defines two benchmark definitions:
Lodash Clone Deep Performance
This benchmark tests the performance of creating a deep copy of an object using Lodash's cloneDeep
function.
Test Preparation Code
var MyObject = {
description: 'Creates a deep copy of source, which should be an object or an array.',
myNumber: 123456789,
myBoolean: true,
jayson: {
stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
parse: 'JSON.parse() method parses a JSON string...',
more: {
less: {
msg: 'Benis'
}
}
},
penis: 'Benis'
};
Purpose
The purpose of this benchmark is to measure the performance of creating a deep copy of an object using Lodash's cloneDeep
function.
Pros and Cons
Using Lodash's cloneDeep
function has several pros:
However, there are also some cons:
cloneDeep
may not be significant for small datasets.Alternative Approach
An alternative approach would be to implement a custom deep cloning function without using a third-party library. This could be done using a recursive function that iterates through the object's properties and creates new copies of each one.
function cloneDeep(obj) {
if (typeof obj !== 'object') return obj;
const result = Array.isArray(obj) ? [] : {};
for (const key in obj) {
result[key] = cloneDeep(obj[key]);
}
return result;
}
This approach would eliminate the dependency on Lodash, but it may be less efficient and more error-prone.
Json Parse Stringify
The second benchmark tests the performance of parsing a JSON string using the JSON.parse
function.
Test Preparation Code
const MyObject = {
description: 'Creates a deep copy of source, which should be an object or an array.',
myNumber: 123456789,
myBoolean: true,
jayson: {
stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
parse: 'JSON.parse() method parses a JSON string...',
more: {
less: {
msg: 'Benis'
}
}
},
penis: 'Benis'
};
Purpose
The purpose of this benchmark is to measure the performance of parsing a JSON string using the JSON.parse
function.
Pros and Cons
Using JSON.parse
has several pros:
However, there are also some cons:
JSON.parse
may be slower than other parsing methods for large datasets.Alternative Approach
An alternative approach would be to use a custom parsing function that implements the JSON specification. This could be done using a recursive function that iterates through the JSON token stream and creates new objects based on each token type.
function parseJson(jsonStr) {
const tokens = jsonStr.split(' ');
const result = {};
for (const token of tokens) {
if (token === 'object') {
// Handle object literal creation
} else if (token === 'array') {
// Handle array literal creation
} else if (token === '"') {
// Handle string creation
}
}
return result;
}
This approach would provide more control over the parsing process, but it may be less efficient and more error-prone.
Libraries
Both benchmarks use the Lodash library. Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, object cloning, and string manipulation.
In this case, the cloneDeep
function is used to create a deep copy of the MyObject
instance.
Special JS Features or Syntax
There are no special JavaScript features or syntax used in these benchmarks. The code uses standard JavaScript syntax and constructs.