var str, strarr
var chars = 'abcdefghijklmnoprstuwxyz'
str = ''
while (str.length < 100) str += chars[ Math.floor( Math.random() * chars.length ) ]
strarr = []
while (strarr.length < 100) strarr.push(chars[ Math.floor( Math.random() * chars.length ) ])
str = strarr.join('')
str = ''
while (str.length < 100) str = `${str}${chars[ Math.floor( Math.random() * chars.length ) ]}`
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
+= | |
array joining | |
template strings |
Test name | Executions per second |
---|---|
+= | 11610.1 Ops/sec |
array joining | 13603.0 Ops/sec |
template strings | 11610.1 Ops/sec |
Let's break down the provided benchmark and its test cases.
Overview
The benchmark compares three ways to concatenate strings in JavaScript: using the +=
operator, array joining (strarr.join('')
), and template strings (${str}${chars[ Math.floor( Math.random() * chars.length ) ]}
).
Test Cases
+=
Operator: This test case uses a while loop to continuously append characters from the string chars
to the variable str
. The number of iterations is controlled by the length of str
, which starts at 0 and increments until it reaches 100.strarr
is created and populated with characters from chars
using the push()
method. Once strarr
has 100 elements, it's joined into a single string using the join()
method, and the result is assigned to the variable str
.${str}${chars[ Math.floor( Math.random() * chars.length ) ]}
creates a new string by appending the randomly selected character from chars
to the existing value of str
.Library and Special Features
Options Compared
The benchmark compares three options:
+=
operatorpush()
and join()
methodsPros and Cons of Each Approach
+=
Operator+=
for large strings, as it avoids the overhead of creating multiple string objects.Other Alternatives
For string concatenation tasks, other alternatives include:
String.prototype.concat()
methodconcat
function)Keep in mind that these alternatives might have their own set of trade-offs and considerations.
I hope this explanation helps you understand the benchmark and its test cases!