String.prototype.replaceAll = function(search, replacement) {
var target = this;
return target.replace(new RegExp(search, 'g'), replacement);
};
"this is it".replace(/\t/g, ' ');
"this is it".replaceAll("\t", " ");
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
replace regex | |
replace All |
Test name | Executions per second |
---|---|
replace regex | 24595440.0 Ops/sec |
replace All | 4884761.0 Ops/sec |
Let's break down the provided JSON and explain what's being tested, compared, and what pros and cons are associated with each approach.
Benchmark Context
The benchmark is designed to compare two different ways of replacing tabs (\t
) with spaces in a string. There are two test cases:
replaceAll
function on the String.prototype
.Options Compared
In this benchmark, we have two options:
a. Regex Replace: This approach uses JavaScript's built-in replace()
method with a regex pattern (/\\t/g
) to replace all occurrences of \t
with spaces.
b. Custom replaceAll
Function: This approach defines a custom function on the String.prototype
, which mimics the behavior of replace()
. The custom function takes two arguments: search
and replacement
.
Pros and Cons
Here are some pros and cons associated with each approach:
a. Regex Replace
Pros:
Cons:
RegExp
with user-input data).b. Custom replaceAll
Function
Pros:
Cons:
Library Used (if applicable)
None. There is no external library used in this benchmark.
Special JS Features/Syntax
There are no special JavaScript features or syntax mentioned in the provided code. However, if we were to interpret the String.prototype.replaceAll
function as using a custom implementation of replace()
, it might be considered a variant of the standard replace()
method, which is a part of the ECMAScript specification.
Alternatives
If you're interested in exploring alternative approaches, here are some options:
lodash
: You could use the _.str.replace()
function from the Lodash library to replace tabs with spaces.String.prototype.replace()
with a callback: Instead of defining a custom replaceAll
function, you could use a callback function as an argument to replace()
. This approach would be more compatible with older JavaScript engines but might be slower due to the overhead of callback invocation.Keep in mind that these alternatives are not necessarily relevant to this particular benchmark, and their adoption would depend on your specific use case and priorities.