Tutorial by Examples: g

For security reasons, PowerShell is set up by default to only allow signed scripts to execute. Executing the following command will allow you to run unsigned scripts (you must run PowerShell as Administrator to do this). Set-ExecutionPolicy RemoteSigned Another way to run PowerShell scripts is t...

Java does not have a Char Stream, so when working with Strings and constructing a Stream of Characters, an option is to get a IntStream of code points using String.codePoints() method. So IntStream can be obtained as below: public IntStream stringToIntStream(String in) { return in.codePoints(); ...

-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...

Configure your project-level build.gradle to include the android-apt plugin: buildscript { repositories { mavenCentral() } dependencies { classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1' } } Then, apply the android-apt plugin in your module-level build...

split allows to divide a vector or a data.frame into buckets with regards to a factor/group variables. This ventilation into buckets takes the form of a list, that can then be used to apply group-wise computation (for loops or lapply/sapply). First example shows the usage of split on a vector: Con...

The border-spacing property determines the spacing between cells. This has no effect unless border-collapse is set to separate. Below an example of two tables with different values to the border-spacing property: The table on the left has border-spacing: 2px (default) while the one on the right ...

3.0 In Swift 3 there are multiple access-levels. This example uses them all except for open: public struct Car { public let make: String let model: String //Optional keyword: will automatically be "internal" private let fullName: String fileprivate var otherName...

public class SuperClass { private func secretMethod() {} } internal class SubClass: SuperClass { override internal func secretMethod() { super.secretMethod() } }

struct Square { private(set) var area = 0 var side: Int = 0 { didSet { area = side*side } } } public struct Square { public private(set) var area = 0 public var side: Int = 0 { didSet { area = side*side } ...

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"

class Animal def method_missing(method, *args, &block) say, speak = method.to_s.split("_") if say == "say" speak else super end end end => a = Animal.new => a.say_moo => "moo" => a.shout_moo => NoMethodE...

Python 2.x2.6 The format() method can be used to change the alignment of the string. You have to do it with a format expression of the form :[fill_char][align_operator][width] where align_operator is one of: < forces the field to be left-aligned within width. > forces the field to be righ...

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

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...

You can use the Integer method to convert a String to an Integer: Integer("123") # => 123 Integer("0xFF") # => 255 Integer("0b100") # => 4 Integer("0555") # => 365 You can also pass a base parameter to the Integer method to c...

CommandDescriptionaAppend text following current cursor positionAAppend text at the end of current lineiInsert text before the current cursor positionIInsert text before first non-blank character of current linegIInsert text in first column of cursor linegiInsert text at same position where it was l...

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...