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How to check if a file is empty in Bash?
...ers are correct but I feel like they could be more complete
/ simplistic etc. for example :
Example 1 : Basic if statement
# BASH4+ example on Linux :
typeset read_file="/tmp/some-file.txt"
if [ ! -s "${read_file}" ] || [ ! -f "${read_file}" ] ;then
echo "Error: file (${read_file}) not fou...
How to rename files and folder in Amazon S3?
...that S3 will create the 'moved' object as a new object with new timestamps etc (iirc).
– JamesBB
Jul 2 '19 at 8:57
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Android Studio: Plugin with id 'android-library' not found
...ready mentioned by some of the other answers, you need the gradle tools in order to use it. Using 3.0.1, you have to use the google repo, not mavenCentral or jcenter:
buildscript {
repositories {
...
//In IntelliJ or older versions of Android Studio
//maven {
// ...
Comparator.reversed() does not compile using lambda
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This is a weakness in the compiler's type inferencing mechanism. In order to infer the type of u in the lambda, the target type for the lambda needs to be established. This is accomplished as follows. userList.sort() is expecting an argument of type Comparator<User>. In the first line, ...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
... a more compact version of the same code. Using some ES6 tricks and higher order functions:
const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl']
const count = names =>
names.reduce((a, b) => ({ ...a,
[b]: (a[b] || 0) + 1
}), {}) // don't forget to initia...
How to link to specific line number on github
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You can you use permalinks to include code snippets in issues, PRs, etc.
References:
https://help.github.com/en/articles/creating-a-permanent-link-to-a-code-snippet
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Is there a Unix utility to prepend timestamps to stdin?
...es, it may be helpful to add BEGIN { $|++; } before the print statement in order to have Perl flush its output with each line.
– user725091
May 29 '14 at 11:25
2
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When to use ref and when it is not necessary in C#
...hod's probably trying to do too much. That's not always the case (TryParse etc are the canonical examples of reasonable use of out) but using ref/out should be a relative rarity.
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Python SQL query string formatting
...e keywords that begin a clause should be right-aligned and the field names etc, should be left aligned. This looks very neat and is easier to debug as well.
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How do you implement a Stack and a Queue in JavaScript?
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To avoid needing to iterate over the entire thing in order to append to the end, store a reference to the last one via this.last=node;
– Perkins
Apr 17 '15 at 4:56
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