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Can I grep only the first n lines of a file?
...e better to use FNR, because if you use awk with multiple files FNR starts from 0 for each file.
– Vladyslav Savchenko
Oct 4 '16 at 9:09
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Adding an onclick function to go to url in JavaScript?
...nt to wait until it completely loads 3) so that, that web page has a table from which I need to extract all the rows. I can able to perform step 1 and if I am on already loaded website then in console I am able to extract table rows (in javascript code). But, when I am trying to write code sequenti...
Overriding the java equals() method - not working?
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In Java, the equals() method that is inherited from Object is:
public boolean equals(Object other);
In other words, the parameter must be of type Object. This is called overriding; your method public boolean equals(Book other) does what is called overloading to the equ...
Best practices/performance: mixing StringBuilder.append with String.concat
... = (new StringBuffer()).append(s1).append(s2).toString();
Taken straight from the Java Best Practices on Oracles website.
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Convert boolean to int in Java
...to vote for such cool answers !
Edit
By the way, I often saw conversions from a boolean to an int for the sole purpose of doing a comparison of the two values (generally, in implementations of compareTo method). Boolean#compareTo is the way to go in those specific cases.
Edit 2
Java 7 introduced...
Adding Python Path on Windows 7
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You can set the path from the current cmd window using the PATH = command. That will only add it for the current cmd instance. if you want to add it permanently, you should add it to system variables. (Computer > Advanced System Settings > ...
count(*) vs count(column-name) - which is more correct? [duplicate]
... the indexing of the table in question, it can be quicker to get the count from the index instead of going to table for the data. Thus you probably should specify the field name, instead of using *.
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JUnit 4 compare Sets
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Check this article. One example from there:
@Test
public void listEquality() {
List<Integer> expected = new ArrayList<Integer>();
expected.add(5);
List<Integer> actual = new ArrayList<Integer>();
actual.ad...
How to align a to the middle (horizontally/width) of the page [duplicate]
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Flexbox solution is the way to go in/from 2015. justify-content: center is used for the parent element to align the content to the center of it.
HTML
<div class="container">
<div class="center">Center</div>
</div>
CSS
.container {
di...
Check if Key Exists in NameValueCollection
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From MSDN:
This property returns null in the following cases:
1) if the specified key is not found;
So you can just:
NameValueCollection collection = ...
string value = collection[key];
if (value == null) // key d...