In helloJohn.sh:
#!/bin/bash
greet() {
local name="$1"
echo "Hello, $name"
}
greet "John Doe"
# running above script
$ bash helloJohn.sh
Hello, John Doe
If you don't modify the argument in any way, there is no need to copy it to a local variabl...
When two margins are touching each other vertically, they are collapsed. When two margins touch horizontally, they do not collapse.
Example of adjacent vertical margins:
Consider the following styles and markup:
div{
margin: 10px;
}
<div>
some content
</div>
<div>...
Functions can take inputs in form of variables that can be used and assigned inside their own scope. The following function takes two numeric values and returns their sum:
function addition (argument1, argument2){
return argument1 + argument2;
}
console.log(addition(2, 3)); // -> 5
...
If a selection on multiple arguments for a type generic expression is wanted, and all types in question are arithmetic types, an easy way to avoid nested _Generic expressions is to use addition of the parameters in the controlling expression:
int max_int(int, int);
unsigned max_unsigned(unsigned, ...
With any variadic function, the function must know how to interpret the variable arguments list. With the printf() or scanf() functions, the format string tells the function what to expect.
The simplest technique is to pass an explicit count of the other arguments (which are normally all the same ...
As long as the element is a block, and it has an explicitly set width value, margins can be used to center block elements on a page horizontally.
We add a width value that is lower than the width of the window and the auto property of margin then distributes the remaining space to the left and the ...
Prefer
public class Order
{
public OrderLine AddOrderLine(OrderLine orderLine)
{
if (orderLine == null) throw new ArgumentNullException(nameof(orderLine));
...
}
}
Over
public class Order
{
public OrderLine AddOrderLine(OrderLine orderLine)
{
...
First, some terminology:
argument (actual parameter): the actual variable being passed to a function;
parameter (formal parameter): the receiving variable that is used in a function.
In Python, arguments are passed by assignment (as opposed to other languages, where arguments can be passed by...
Many context managers return an object when entered. You can assign that object to a new name in the with statement.
For example, using a database connection in a with statement could give you a cursor object:
with database_connection as cursor:
cursor.execute(sql_query)
File objects retur...
if ($PSCmdlet.ShouldProcess("Target of action")) {
# Do the thing
}
When using -WhatIf:
What if: Performing the action "Invoke-MyCmdlet" on target "Target of action"
When using -Confirm:
Are you sure you want to perform this action?
Performing operation &qu...
Template may accept both lvalue and rvalue references using forwarding reference:
template <typename T>
void f(T &&t);
In this case, the real type of t will be deduced depending on the context:
struct X { };
X x;
f(x); // calls f<X&>(x)
f(X()); // calls f<X>(...
After receiving the arguments, you can print them as follows:
int main(int argc, char **argv)
{
for (int i = 1; i < argc; i++)
{
printf("Argument %d: [%s]\n", i, argv[i]);
}
}
Notes
The argv parameter can be also defined as char *argv[].
argv[0] may co...
The following program says hello to the user. It takes one positional argument, the name of the user, and can also be told the greeting.
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('name',
help='name of user'
)
parser.add_argument('-g', '--greeting',
...
You can use a RecyclerView.ItemDecoration to put extra margins around each item in a RecyclerView. This can in some cases clean up both your adapter implementation and your item view XML.
public class MyItemDecoration
extends RecyclerView.ItemDecoration {
private final int extraMargin;
...
Putting a & (ampersand) in front of an argument will pass it as the method's block. Objects will be converted to a Proc using the to_proc method.
class Greeter
def to_proc
Proc.new do |item|
puts "Hello, #{item}"
end
end
end
greet = Greeter.new
%w(world l...
One common use case for generators is reading a file from disk and iterating over its contents. Below is a class that allows you to iterate over a CSV file. The memory usage for this script is very predictable, and will not fluctuate depending on the size of the CSV file.
<?php
class CsvReade...
ArgumentCondition
This method checks to see if the argument specified is true. It also takes in the name of the argument that is logged if the condition fails.
Assert.ArgumentCondition(pageIndex >= 0, "pageIndex", "Value must be greater than or equal to zero.");
ArgumentN...
