stri_dup("abc",3)
# [1] "abcabcabc"
A base R solution that does the same would look like this:
paste0(rep("abc",3),collapse = "")
# [1] "abcabcabc"
You can specify different application IDs or package names for each buildType or productFlavor using the applicationIdSuffix configuration attribute:
Example of suffixing the applicationId for each buildType:
defaultConfig {
applicationId "com.package.android"
minSdkVersion 17
...
To compare strings alphabetically, use localeCompare(). This returns a negative value if the reference string is lexicographically (alphabetically) before the compared string (the parameter), a positive value if it comes afterwards, and a value of 0 if they are equal.
var a = "hello";
va...
This is an example of a function which returns a string. In the example, the function is called in a statement assigning a value to a variable. The value in this case is the return value of the function.
function Get-Greeting{
"Hello World"
}
# Invoking the function
$greeting ...
A function can be defined with parameters using the param block:
function Write-Greeting {
param(
[Parameter(Mandatory,Position=0)]
[String]$name,
[Parameter(Mandatory,Position=1)]
[Int]$age
)
"Hello $name, you are $age years old."
}
...
Parameters to a function can be marked as mandatory
function Get-Greeting{
param
(
[Parameter(Mandatory=$true)]$name
)
"Hello World $name"
}
If the function is invoked without a value, the command line will prompt for the value:
$greeting = Get-Greeting
...
A compound view is a custom ViewGroup that's treated as a single view by the surrounding program code. Such a ViewGroup can be really useful in DDD-like design, because it can correspond to an aggregate, in this example, a Contact. It can be reused everywhere that contact is displayed.
This means t...
This example listens for input coming in over the serial connection, then repeats it back out the same connection.
byte incomingBytes;
void setup() {
Serial.begin(9600); // Opens serial port, sets data rate to 9600 bps.
}
void loop() {
// Send data only when you receive...
If the user authorizes your application, they will be redirected to the following URL:
https://[your registered redirect URI]/#access_token=[an access token]
&scope=[authorized scopes]
Note that the access token is in the URL fragment and not the query string. This means the value w...
Class constants provide a mechanism for holding fixed values in a program. That is, they provide a way of giving a name (and associated compile-time checking) to a value like 3.14 or "Apple". Class constants can only be defined with the const keyword - the define function cannot be used in...
This section provides code and benchmarks for ten unique example implementations which iterate over the entries of a Map<Integer, Integer> and generate the sum of the Integer values. All of the examples have an algorithmic complexity of Θ(n), however, the benchmarks are still useful for provid...
Glide includes two default transformations, fit center and center crop.
Fit center:
Glide.with(context)
.load(yourUrl)
.fitCenter()
.into(yourView);
Fit center performs the same transformation as Android's ScaleType.FIT_CENTER.
Center crop:
Glide.with(context)
.load(yourUr...
The base package parallel allows parallel computation through forking, sockets, and random-number generation.
Detect the number of cores present on the localhost:
parallel::detectCores(all.tests = FALSE, logical = TRUE)
Create a cluster of the cores on the localhost:
parallelCluster <- para...
A major problem with parallelization is the used of RNG as seeds. Random numbers by the number are iterated by the number of operations from either the start of the session or the most recent set.seed(). Since parallel processes arise from the same function, it can use the same seed, possibly causin...
If there are sections of code that you are considering removing or want to temporarily disable, you can comment it out with a block comment.
/* Block comment around whole function to keep it from getting used.
* What's even the purpose of this function?
int myUnusedFunction(void)
{
int i =...
Let's say we have the following structure:
struct MY_STRUCT
{
int my_int;
float my_float;
};
We can define MY_STRUCT to omit the struct keyword so we don't have to type struct MY_STRUCT each time we use it. This, however, is optional.
typedef struct MY_STRUCT MY_STRUCT;
If we th...
If MsgBox("Click OK") = vbOK Then
can be used in place of
If MsgBox("Click OK") = 1 Then
in order to improve readability.
Use Object Browser to find available VB constants. View → Object Browser or F2 from VB Editor.
Enter class to search
View members available
...
Descriptive names and structure in your code help make comments unnecessary
Dim ductWidth As Double
Dim ductHeight As Double
Dim ductArea As Double
ductArea = ductWidth * ductHeight
is better than
Dim a, w, h
a = w * h
This is especially helpful when you are copying data from one ...
The .GetValueOrDefault() method returns a value even if the .HasValue property is false (unlike the Value property, which throws an exception).
class Program
{
static void Main()
{
int? nullableExample = null;
int result = nullableExample.GetValueOrDefault();
C...
