var example = 'there is no spoon'
var result = example.slice(0,example.length-1)
var result = example.substring(0,example.length-1)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
slice | |
substring |
Test name | Executions per second |
---|---|
slice | 7659330.5 Ops/sec |
substring | 7694697.5 Ops/sec |
Let's break down the provided JSON benchmark and explain what's being tested.
Benchmark Definition
The provided JSON defines a benchmark named "slice vs substring (removing rightmost char)" that compares two JavaScript methods: slice()
and substring()
. The purpose of this benchmark is to measure which method performs better when removing the last character from a string.
Options Compared
Two options are being compared:
slice()
: This method returns a new string by extracting a section of a given string.substring()
: This method also extracts a section of a given string, but it requires specifying both start and end indices.Pros and Cons of Each Approach
slice()
:substring()
for removing a single character, since it involves creating a new string object.slice()
, as you need to specify both start and end indices.Other Considerations
Both methods have performance implications due to how they handle string creation. When using slice()
, the resulting string is created from scratch, which can be slower. In contrast, substring()
may use a technique called "substring caching" (not explicitly shown in this benchmark), where it precomputes some information about the original string to quickly determine the substring length.
Library and Its Purpose
There is no library mentioned in the provided JSON. However, both slice()
and substring()
are built-in JavaScript methods that don't rely on external libraries.
Special JS Features or Syntax
None of the features or syntax used in this benchmark require special knowledge or extensions beyond standard JavaScript.