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Two Arrays var array1 = [1, 2]; var array2 = [3, 4, 5]; 3 var array3 = array1.concat(array2); // returns a new array 6 var array3 = [...array1, ...array2] Results in a new Array: [1, 2, 3, 4, 5] Multiple Arrays var array1 = ["a", "b"], array2 = ["...

1 + 2 # Addition 1 - 2 # Subtraction -1 # Set negative value 1 * 2 # Multiplication 1 / 2 # Division 1 % 2 # Modulus 100 -shl 2 # Bitwise Shift-left 100 -shr 1 # Bitwise Shift-right

-and # Logical and -or # Logical or -xor # Logical exclusive or -not # Logical not ! # Logical not

Simple arithmetic: $var = 1 # Assignment. Sets the value of a variable to the specified value $var += 2 # Addition. Increases the value of a variable by the specified value $var -= 1 # Subtraction. Decreases the value of a variable by the specified value $var *= 2 # Multiplicati...

PowerShell comparison operators are comprised of a leading dash (-) followed by a name (eq for equal, gt for greater than, etc...). Names can be preceded by special characters to modify the behavior of the operator: i # Case-Insensitive Explicit (-ieq) c # Case-Sensitive Explicit (-ceq) Case-I...

Success output stream: cmdlet > file # Send success output to file, overwriting existing content cmdlet >> file # Send success output to file, appending to existing content cmdlet 1>&2 # Send success and error output to error stream Error output stream: cmdlet 2&g...

class Animal def method_missing(method, *args, &block) "Cannot call #{method} on Animal" end end => Animal.new.say_moo > "Cannot call say_moo on Animal"

Arrays can have the allocatable attribute: ! One dimensional allocatable array integer, dimension(:), allocatable :: foo ! Two dimensional allocatable array real, dimension(:,:), allocatable :: bar This declares the variable but does not allocate any space for it. ! We can specify the bounds...

Installation Installing Codename One In NetBeans These instructions assume you have downloaded a recent version of NetBeans (at this time 8.x), installed and launched it. Select the Tools->Plugins menu option Select the Available Plugins Tab Check The CodenameOne Plugin ...

To previous view controller To pop back to the previous page you can do this: Swift navigationController?.popViewControllerAnimated(true) Objective-C [self.navigationController popViewControllerAnimated:YES]; To root view controller To pop to the root of the navigation stack, you can do...

In your storyboard select the ViewController that you want to embed into a Navigation Controller. Then navigate to Editor > Embed In > Navigation Controller And that will create your navigation controller

Detailed instructions on getting Verilog set up or installed is dependent on the tool you use since there are many Verilog tools.

What is AJAX? AJAX stands for Asynchronous JavaScript and XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with server-side scripts. It can send as well as receive information in a variety of formats, including JSON, XML, HTML, and even text files. -Mozilla Devel...

0 # creates the Fixnum 0 123 # creates the Fixnum 123 1_000 # creates the Fixnum 1000. You can use _ as separator for readability By default the notation is base 10. However, there are some other built-in notations for different bases: 0xFF # Hexadecimal representation of 255, s...

Library cargo new my-library This creates a new directory called my-library containing the cargo config file and a source directory containing a single Rust source file: my-library/Cargo.toml my-library/src/lib.rs These two files will already contain the basic skeleton of a library, such th...

Android supports several configuration qualifiers that allow you to control how the system selects your alternative resources based on the characteristics of the current device screen. A configuration qualifier is a string that you can append to a resource directory in your Android project and speci...

To run a specific migration up or down, use db:migrate:up or db:migrate:down. Up a specific migration: 5.0 rake db:migrate:up VERSION=20090408054555 5.0 rails db:migrate:up VERSION=20090408054555 Down a specific migration: 5.0 rake db:migrate:down VERSION=20090408054555 5.0 ra...

To create a join table between students and courses, run the command: $ rails g migration CreateJoinTableStudentCourse student course This will generate the following migration: class CreateJoinTableStudentCourse < ActiveRecord::Migration[5.0] def change create_join_table :students, ...

To run migrations in the test environment, run this shell command: rake db:migrate RAILS_ENV=test 5.0 Starting in Rails 5.0, you can use rails instead of rake: rails db:migrate RAILS_ENV=test

To add a new column name to the users table, run the command: rails generate migration AddNameToUsers name This generates the following migration: class AddNameToUsers < ActiveRecord::Migration[5.0] def change add_column :users, :name, :string end end When the migration name i...