Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you an example analysis of the calculation of editing distance and front-end performance testing tools in Digest. The article is rich in content and analyzed and described from a professional point of view. I hope you can get something after reading this article.

Learn some algorithms every day Google interview questions: calculate the editing distance

The editing distance between two strings is the minimum number of inserts, deletions, and replacements that need to be converted to another string. For example, the editing distance between "kitten" and "sitting" is 3.

The edit distance between two strings refers to the minimum number of character insertions, deletions, and substitutions required to change one string to the other. For example, the edit distance between "kitten" and "sitting" is three: substitute the "k" for "s", substitute the "e" for "I", and append a "g".

Given two strings, calculate their editing distance.

Given two strings, compute the edit distance between them.

Def edit_distance (string1 String2): "" Ref: https://bit.ly/2Pf4a6Z""" if len (string1) > len (string2): difference = len (string1)-len (string2) string1 [: difference] elif len (string2) > len (string1): difference = len (string2)-len (string1) string2 [: difference] else: difference = 0 for i in range (len (string1)) : if string1 [I]! = string2 [I]: difference + = 1 return differenceprint (edit_distance ("kitten") "sitting") # 3print (edit_distance ("medium", "median")) # 2 others worth reading that will make you a command line ninja

Original: This Will Make You a Command-Line Ninja

Unix philosophy

Write programs that do one thing and do it well. | the program written only does one thing, and it has to be done well. Write programs to work together. | programs should be able to work together. Write programs to handle text streams, because that is a universal interface. | write a program to deal with text stream, because it is a general interface.

Variable

$0-name of the current script

$1.. $9-the first nine parameters of the script.

$#-number of parameters passed to the script.

$@-all parameters provided to the script.

$USER-the user name of the user running the script.

$HOSTNAME-the hostname of the machine on which the script is running.

$SECONDS-the number of seconds after the script was started.

$RANDOM-returns a different random number each time it is referenced.

$LINENO-returns the current line number in the Bash script.

How to monitor the basic system indicators in Linux

Original: LFCA: How to Monitor Basic System Metrics in Linux

# get the system's date and the time the system was turned on.uptime-suptime-p # To get a glimpse of the total and available memory and swap space on your systemfree-h # provides a summary of the real-time system metrics and displays the currently running processes that are managed by the Linux kernel.top# $sudo apt install htop [On Debian-based] # $sudo dnf install htop [On RHEL-based] htop# The df command provides information on hard disk utilization per filesystem.df-Th Free frontend performance testing tool

FREE FRONT END PERFORMANCE TESTING TOOLS

Web Page Test can quickly test what's wrong with slow-loading websites.

GTMetrix is similar to the above, with Google PageSpeed Grade and Yslow Grades.

Google Page Speed Insights they offer both mobile and desktop testing. Interestingly, they use mobile views by default.

Y-SLOW Y-slow is a browser plug-in to test the speed of web pages (launched by Yahoo), which can be used by almost all modern browsers except IE.

Neustar Ultratools A collection of tools for hosting speed checks, DNS checks, and more. They keep moving things around and adding/removing features.

Sitespeed.io is used to evaluate the client performance of real browsers.

ManageWP can manage multiple WP sites from one location.

To be mature you have to realize what you value most. If you want to be a mature person, you must realize your most precious things.

The prerequisite for success is to learn to choose.

The above is the example analysis of calculating editing distance and front-end performance testing tools in Digest shared by Xiaobian. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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