As a Rails developer I'm often faced with the task of processing and manipulating strings. These useful methods for string manipulation in Ruby are strip
, lstrip
and rstrip
. In this blog post, we will explore the differences between these methods and how they can be used in Ruby or Rails.
What is strip
in Ruby?
The strip
method in Ruby is used to remove leading and trailing white spaces from a string. This is useful when you have text that is pulled in from another source and may contain unwanted white spaces at the beginning or end of the string. Here's an example of using strip
:
string = " Remove leading and trailing spaces "
stripped_string = string.strip
puts stripped_string
# => "Remove leading and trailing spaces "
What is lstrip
in Ruby?
The lstrip
method in Ruby is used to remove leading white spaces from a string. This is useful when you want to remove white spaces from the beginning of a string, but keep any white spaces that appear at the end of the string. Here's an example of using lstrip
:
string = " Remove leading and trailing spaces "
l_stripped_string = string.lstrip
puts l_stripped_string
# => "Remove leading and trailing spaces "
What is rstrip
in Ruby?
The rstrip
method in Ruby is used to remove only the trailing white spaces from a string. This is useful when you have text that is pulled in from another source and may contain unwanted white spaces at the end of the string. Here's an example of using rstrip
:
string = " Remove trailing spaces "
r_stripped_string = string.rstrip
puts r_stripped_string
# => " Remove leading and trailing spaces"
Differences between strip
, lstrip
and rstrip
Method | Description |
---|---|
strip |
Removes leading and trailing white spaces |
lstrip |
Removes leading white spaces |
rstrip |
Removes trailing white spaces |
As you can see, the main difference between strip
,lstrip
and rstrip
is the type of white spaces they remove. strip
removes both leading and trailing white spaces, lstrip
only removes leading white spaces, while rstip
only removes trailing white spaces.
Performance
When it comes to performance, strip
, lstrip
and rstrip
are relatively fast. To compare the performance of these methods, we can run a benchmark test using the Ruby benchmark
library. Here's an example:
require 'benchmark'
string = " When it comes to performance, strip, lstrip and rstrip are relatively fast. To compare the performance of these methods, we can run a benchmark test using the Ruby benchmark library. Here's an example: "
Benchmark.bm do |x|
x.report("strip:") { 100000.times { string.strip } }
x.report("lstrip:") { 100000.times { string.lstrip } }
x.report("rstrip:") { 100000.times { string.rstrip } }
end
user | system | total | real | |
---|---|---|---|---|
strip |
0.029657 | 0.060237 | 0.089894 | ( 0.141788) |
lstrip |
0.035660 | 0.000601 | 0.036261 | ( 0.036798) |
rstrip |
0.027587 | 0.000578 | 0.028165 | ( 0.028700) |
[#
<Benchmark::Tms:0x0000000112b2faa8 @label="strip:", @real=0.14178800000809133, @cstime=0.0, @cutime=0.0, @stime=0.060236999999999985, @utime=0.029656999999999933, @total=0.08989399999999992>, #
<Benchmark::Tms:0x0000000112b2fa08 @label="lstrip:", @real=0.036798000102862716, @cstime=0.0, @cutime=0.0, @stime=0.0006009999999999627, @utime=0.035660000000000025, @total=0.03626099999999999>, #
<Benchmark::Tms:0x0000000112b2f9b8 @label="rstrip:", @real=0.02870000002440065, @cstime=0.0, @cutime=0.0, @stime=0.0005779999999999674, @utime=0.027587000000000028, @total=0.028164999999999996>
]
The results of the benchmark test show that strip
, lstrip
and rstrip
are very fast methods, with rstrip
being slightly faster than both strip
and lstrip
in this case. However, the difference in performance is very small and likely to be negligible in most real-world applications.
Combination with other methods
Each of strip
, lstrip
and rstrip
can be combined with other string methods in Ruby to achieve more complex string manipulations. For example, you can use gsub
to replace specific characters in a string, and then use strip
, lstrip
or rstrip
to remove any whitespace from the start or end. Here's an example using split()
method to split a string into an array based on a specific delimiter, and then using lstrip
to remove any whitespace from the left of each element:
text = " apple , banana , cherry "
s_text = text.split(",").map(&:strip).to_s
puts 'Strip =' + s_text
# => Strip =["apple", "banana", "cherry"]
l_text = text.split(",").map(&:lstrip).to_s
puts 'lStrip =' + l_text
# => lStrip =["apple ", "banana ", "cherry "]
r_text = text.split(",").map(&:rstrip).to_s
puts 'rStrip =' + r_text
# => rStrip =[" apple", " banana", " cherry"]
By combining strip and lstrip with other string methods, you can easily manipulate and clean up strings in your code.
Final thoughts
Choosing between strip
, lstrip
and rstrip
depends on the specific use case and the desired outcome. If you need to remove whitespaces from both ends of a string, then use strip
. If you only need to remove whitespaces from the left end, then use lstrip
. And If you only need to remove whitespaces from the right end, then use rstrip
.
It's always good to test theose methods and choose the one that meets your requirements and performs best.
In conclusion, understanding the differences between strip
, lstrip
and rstrip
is important to make the right choice and get the expected results in your Ruby on Rails code. By following the advice and examples in this article, you'll be able to make an informed decision and use the right method for the job.
And as usual, Happy Coding 😀 💻
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