Sometimes, it's not possible to list the number of parameters a function could need. Consider a sum function:
func sum(_ a: Int, _ b: Int) -> Int {
return a + b
}
This works fine for finding the sum of two numbers, but for finding the sum of three we'd have to write another function:
f...
If you want to display to your users meaningful errors instead of simple "sorry, something went wrong", Rails has a nice utility for the purpose.
Open the file app/controllers/application_controller.rb and you should find something like this:
class ApplicationController < ActionContro...
The border-radius property allows you to change the shape of the basic box model.
Every corner of an element can have up to two values, for the vertical and horizontal radius of that corner (for a maximum of 8 values).
The first set of values defines the horizontal radius. The optional second ...
The border-style property sets the style of an element's border.
This property can have from one to four values (for every side of the element one value.)
Examples:
border-style: dotted;
border-style: dotted solid double dashed;
border-style can also have the values none and hidden. They ...
It is possible to limit the tests executed by manage.py test by specifying which modules should be discovered by the test runner:
# Run only tests for the app names "app1"
$ python manage.py test app1
# If you split the tests file into a module with several tests files for an app
$ p...
<PROJECT_ROOT>\app\build.gradle is specific for app module.
<PROJECT_ROOT>\build.gradle is a "Top-level build file" where you can add configuration options common to all sub-projects/modules.
If you use another module in your project, as a local library you would have another...
Get width and height:
var width = $('#target-element').width();
var height = $('#target-element').height();
Set width and height:
$('#target-element').width(50);
$('#target-element').height(100);
Get width and height:
var width = $('#target-element').innerWidth();
var height = $('#target-element').innerHeight();
Set width and height:
$('#target-element').innerWidth(50);
$('#target-element').innerHeight(100);
Get width and height (excluding margin):
var width = $('#target-element').outerWidth();
var height = $('#target-element').outerHeight();
Get width and height (including margin):
var width = $('#target-element').outerWidth(true);
var height = $('#target-element').outerHeight(true);
Set widt...
The return statement can be a useful way to create output for a function. The return statement is especially useful if you do not know in which context the function will be used yet.
//An example function that will take a string as input and return
//the first character of the string.
function...
We will see how to center content based on the height of a near element.
Compatibility: IE8+, all other modern browsers.
HTML
<div class="content">
<div class="position-container">
<div class="thumb">
<img src="http://lorempix...
Picasso supports both download and error placeholders as optional features. Its also provides callbacks for handling the download result.
Picasso.with(context)
.load("YOUR IMAGE URL HERE")
.placeholder(Your Drawable Resource) //this is optional the image to display while the url i...
people := map[string]int{
"john": 30,
"jane": 29,
"mark": 11,
}
for _, value := range people {
fmt.Println("Age:", value)
}
Note that when iterating over a map with a range loop, the iteration order is not specified and is not guaranteed to...
Enumerating dictionaries allows you to run a block of code on each dictionary key-value pair using the method enumerateKeysAndObjectsUsingBlock:(void (^)(id key, id obj, BOOL *stop))block
Example:
NSDictionary stockSymbolsDictionary = @{
@"AAPL":...
Given a file file.txt with the following content:
line 1
line 2
line 3
You can delete a line from file content with the d command.
The pattern to match is surrounded with default / delimiter and the d command follows the pattern:
sed '/line 2/d' file.txt
The above command will output:
l...
Fourier Transform is probably the first lesson in Digital Signal Processing, it's application is everywhere and it is a powerful tool when it comes to analyze data (in all sectors) or signals. Matlab has a set of powerful toolboxes for Fourier Transform. In this example, we will use Fourier Transfor...
If your project depends on the external libraries, you should first install them with opam.
Assuming your dependencies are foo and bar and the main entry point of your project is foobar.ml you can then build a bytecode executable with
ocamlbuild -use-ocamlfind -pkgs 'foo,bar' foobar.byte
Warnin...
If your project has no external dependency and has foo.ml as its main entry point, you can compile a bytecode version with
ocamlbuild foo.byte
To get a native executable, run
ocamlbuild foo.native
