Tutorial by Examples: p

When using async queries, you can execute multiple queries at the same time, but not on the same context. If the execution time of one query is 10s, the time for the bad example will be 20s, while the time for the good example will be 10s. Bad Example IEnumerable<TResult1> result1; IEnumera...

Apart from LF the only allowed white space character is Space (ASCII value 32). Note that this implies that other white space characters (in, for instance, string and character literals) must be written in escaped form. \', \", \\, \t, \b, \r, \f, and \n should be preferred over corres...

package com.example.my.package; The package declaration should not be line wrapped, regardless of whether it exceeds the recommended maximum length of a line.

// First java/javax packages import java.util.ArrayList; import javax.tools.JavaCompiler; // Then third party libraries import com.fasterxml.jackson.annotation.JsonProperty; // Then project imports import com.example.my.package.ClassA; import com.example.my.package.ClassB; // Then stat...

Source code and comments should generally not exceed 80 characters per line and rarely if ever exceed 100 characters per line, including indentation. The character limit must be judged on a case by case basis. What really matters is the semantical “density” and readability of the line. Making l...

int someMethod(String aString, List<Integer> aList, Map<String, String> aMap, int anInt, long aLong, Set<Number> aSet, double aDouble) { … } int someMethod(String aString, List&...

If a line approaches the maximum character limit, always consider breaking it down into multiple statements / expressions instead of wrapping the line. Break before operators. Break before the . in chained method calls. popupMsg("Inbox notification: You have " + newMsgs + &...

Vertical Whitespace A single blank line should be used to separate… Package declaration Class declarations Constructors Methods Static initializers Instance initializers …and may be used to separate logical groups of import statements fields statements Multiple consec...

Runnable r = () -> System.out.println("Hello World"); Supplier<String> c = () -> "Hello World"; // Collection::contains is a simple unary method and its behavior is // clear from the context. A method reference is preferred here. appendFilter(goodStrings::cont...

return flag ? "yes" : "no"; String cmp = (flag1 != flag2) ? "not equal" : "equal"; // Don't do this return (flag ? "yes" : "no"); Redundant grouping parentheses (i.e. parentheses that does not affect evaluation) may be used if t...

Note the use of {{.}} to output the item within the template. package main import ( "fmt" "os" "text/template" ) func main() { const ( letter = `Dear {{.}}, How are you?` ) tmpl, err := template.New("letter").Pa...

Note the use of {{range .}} and {{end}} to cycle over the collection. package main import ( "fmt" "os" "text/template" ) func main() { const ( letter = `Dear {{range .}}{{.}}, {{end}} How are you?` ) tmpl, err := template...

In this example, a function map named funcMap is supplied to the template via the Funcs() method and then invoked inside the template. Here, the function increment() is used to get around the lack of a less than or equal function in the templating language. Note in the output how the final item in t...

Note how field values are obtained using {{.FieldName}}. package main import ( "fmt" "os" "text/template" ) type Person struct { FirstName string LastName string Street string City string State string Zip...

Note the different package import. package main import ( "fmt" "html/template" "os" ) type Person struct { FirstName string LastName string Street string City string State string Zip string Ava...

First, here's what can happen when text/template is used for HTML. Note Harry's FirstName property). package main import ( "fmt" "html/template" "os" ) type Person struct { FirstName string LastName string Street string Cit...

context.lineCap=capStyle // butt (default), round, square Sets the cap style of line starting points and ending points. butt, the default lineCap style, shows squared caps that do not extend beyond the line's starting and ending points. round, shows rounded caps that extend beyond the ...

context.lineJoin=joinStyle // miter (default), round, bevel Sets the style used to connect adjoining line segments. miter, the default, joins line segments with a sharp joint. round, joins line segments with a rounded joint. bevel, joins line segments with a blunted joint. <!doctype...

context.strokeStyle=color Sets the color that will be used to stroke the outline of the current path. These are color options (these must be quoted): A CSS named color, for example context.strokeStyle='red' A hex color, for example context.strokeStyle='#FF0000' An RGB color, for e...

context.fillStyle=color Sets the color that will be used to fill the interior of the current path. These are color options (these must be quoted): A CSS named color, for example context.fillStyle='red' A hex color, for example context.fillStyle='#FF0000' An RGB color, for example ...