const padding = '64px'
const num = parseInt(padding)
const padding = '64px'
const num = Number(padding.match(/\d*/g)[0])
const padding = '"68.08px"'
const num = parseFloat(padding)
const padding = '64px'
const num = parseFloat(padding)
const padding = '64'
const num = parseInt(padding)
const padding = '64'
const num = Number(padding)
const padding = '64'
const num = parseFloat(padding)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
parseInt | |
regex | |
float | |
float int | |
string parse | |
string num | |
string float |
Test name | Executions per second |
---|---|
parseInt | 5661406.0 Ops/sec |
regex | 2823005.2 Ops/sec |
float | 6361408.0 Ops/sec |
float int | 6886441.5 Ops/sec |
string parse | 8269890.0 Ops/sec |
string num | 8626571.0 Ops/sec |
string float | 8527837.0 Ops/sec |
What is being tested?
The provided JSON represents microbenchmarks for parsing numbers from strings in JavaScript. The tests compare different approaches to achieve this goal:
parseInt()
function to convert a string to an integer.parseFloat()
function to convert a string to a floating-point number.parseFloat
, but without the prefix.parseInt
in older browsers): An older implementation of parseInt
that can handle strings with prefixes like '64px'.parseFloat
): Similar to parseFloat
, but optimized for parsing numeric strings without decimal points.parseFloat
specifically designed for parsing floating-point numbers.Options comparison
Each approach has its pros and cons:
parseFloat
, but without the prefix.In general, the choice of approach depends on the specific requirements and constraints of your project. If you need a simple, fast solution that works for most numeric formats, parseInt
or parseFloat
might be sufficient. However, if you need to handle more complex string parsing scenarios or require fine-grained control over the parsing process, regex or the optimized versions (float
, string num
) might be better suited.
Libraries and special features
None of the provided tests rely on external libraries. The built-in JavaScript functions (parseInt
, parseFloat
) are used throughout.
However, it's worth noting that some browsers may have additional features or optimizations for parsing numbers from strings, such as:
Number()
function: In modern browsers, using Number()
can be a more efficient and accurate way to parse numeric strings.Alternatives
Other alternatives for parsing numbers from strings in JavaScript include:
numeral.js
or string-parsing
for more complex string parsing needs.regex-optimizer
to optimize and improve regex performance.Keep in mind that these alternatives may introduce additional complexity, dependencies, or performance overhead, depending on your project's needs.