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How can I shuffle an array? [duplicate]
...lements in the array
while (counter > 0) {
// Pick a random index
let index = Math.floor(Math.random() * counter);
// Decrease counter by 1
counter--;
// And swap the last element with it
let temp = array[counter];
array[counter] = arr...
Get key by value in dictionary
...ver name for whatever language). In python, it's a fact that you can still index through the values of the structure to find out the corresponding keys.
– Tropicalrambler
Jun 8 at 2:49
...
What is the Java ?: operator called and what does it do?
... it is a shorthand form of
int count;
if (isHere)
count = getHereCount(index);
else
count = getAwayCount(index);
It's called the conditional operator. Many people (erroneously) call it the ternary operator, because it's the only ternary (three-argument) operator in Java, C, C++, and probabl...
Difference between /res and /assets directories
...o declare a list of all the resource IDs that might be used and compute an index into the the list. (This is kind of awkward and introduces opportunities for error if the set of resources changes in the development cycle.) (EDIT: you can retrieve a resource ID by name using getIdentifier, but this l...
upstream sent too big header while reading response header from upstream
...h logged lines preceding the message? PHP message: PHP Notice: Undefined index:
Example snippet from a loop my log file:
2015/11/23 10:30:02 [error] 32451#0: *580927 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined index: Firstname in /srv/www/classes/data_convert.php on line 1090
PHP...
How can a Java program get its own process ID?
...ng jvmName = ManagementFactory.getRuntimeMXBean().getName();
final int index = jvmName.indexOf('@');
if (index < 1) {
// part before '@' empty (index = 0) / '@' not found (index = -1)
return fallback;
}
try {
return Long.toString(Long.parseLong(jvmName.su...
Read/write to Windows registry using Java
...o[0]; // count
int maxlen = info[3]; // value length max
for(int index=0; index<count; index++) {
byte[] name = (byte[]) regEnumValue.invoke(root, new Object[] {
new Integer
(handles[0]), new Integer(index), new Integer(maxlen + 1)});
String value = re...
Get data from fs.readFile
...
const fs = require('fs');
// First I want to read the file
fs.readFile('./Index.html', function read(err, data) {
if (err) {
throw err;
}
const content = data;
// Invoke the next step here however you like
console.log(content); // Put all of the code here (not the bes...
pythonic way to do something N times without an index variable?
Every day I love python more and more.
8 Answers
8
...
How do you rotate a two dimensional array?
...imensional array:
matrix = [
[0,1],
[2,3]
]
Therefore the first index position accesses the row. The second index position accesses the column:
matrix[row][column]
We’ll define a utility function to print a matrix.
def print_matrix(matrix):
for row in matrix:
print row
...