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What does curly brackets in the `var { … } = …` statements do?
... one is block-level variables:
let allows you to declare variables, limiting its scope to the block, statement, or expression on which it is used. This is unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.
The second one is ca...
Once upon a time, when > was faster than < … Wait, what?
I am reading an awesome OpenGL tutorial . It's really great, trust me. The topic I am currently at is Z-buffer. Aside from explaining what's it all about, the author mentions that we can perform custom depth tests, such as GL_LESS, GL_ALWAYS, etc. He also explains that the actual meaning of depth v...
How to calculate the number of days between two dates? [duplicate]
...follow
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edited Sep 15 '19 at 17:09
Илья Зеленько
4,49322 gold badges2727 silver badges4141 bronze badges
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How to change the text on the action bar
Currently it just displays the name of the application and I want it to display something custom and be different for each screen in my app.
...
PDO get the last ID inserted
...");
$stmt->execute();
$id = $db->lastInsertId();
If you want to do it with SQL instead of the PDO API, you would do it like a normal select query:
$stmt = $db->query("SELECT LAST_INSERT_ID()");
$lastId = $stmt->fetchColumn();
...
Is there a Null OutputStream in Java?
...
Since Java 11, there is a static utility that does exactly what you need, a static factory method OutputStream.nullOutputStream():
Returns a new OutputStream which discards all bytes. The returned stream is initially open. The stream is closed by calling the...
Python string.replace regular expression [duplicate]
...eplace() v2|v3 does not recognize regular expressions.
To perform a substitution using a regular expression, use re.sub() v2|v3.
For example:
import re
line = re.sub(
r"(?i)^.*interfaceOpDataFile.*$",
"interfaceOpDataFile %s" % fileIn,
line
)
In a loo...
Converting 'ArrayList to 'String[]' in Java
...tring[] stringArray = list.toArray(new String[0]);
The toArray() method without passing any argument returns Object[]. So you have to pass an array as an argument, which will be filled with the data from the list, and returned. You can pass an empty array as well, but you can also pass an array wi...
What is the difference between LL and LR parsing?
...parser continuously picks a substring of the input and attempts to reverse it back to a nonterminal.
During an LL parse, the parser continuously chooses between two actions:
Predict: Based on the leftmost nonterminal and some number of lookahead tokens, choose which production ought to be applied...
Improve subplot size/spacing with many subplots in matplotlib
Very similar to this question but with the difference that my figure can be as large as it needs to be.
6 Answers
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