Tutorial by Examples: i

string s = "Foo"; string paddedLeft = s.PadLeft(5); // paddedLeft = " Foo" (pads with spaces by default) string paddedRight = s.PadRight(6, '+'); // paddedRight = "Foo+++" string noPadded = s.PadLeft(2); // noPadded = "Foo" (original string...

var wsHost = "ws://my-sites-url.com/path/to/web-socket-handler"; var ws = new WebSocket(wsHost);

var wsHost = "ws://my-sites-url.com/path/to/echo-web-socket-handler"; var ws = new WebSocket(wsHost); var value = "an example message"; //onmessage : Event Listener - Triggered when we receive message form server ws.onmessage = function(message) { if (message === value...

String can be formatted to accept a padding parameter that will specify how many character positions the inserted string will use : ${value, padding} NOTE: Positive padding values indicate left padding and negative padding values indicate right padding. Left Padding A left padding of 5 (a...

You can use a relative path to link to pages on the same website. <a href="/example">Text Here</a> The above example would go to the file example at the root directory (/) of the server. If this link was on http://example.com, the following two links would bring the user...

5.1 The reduce() method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value. Array Sum This method can be used to condense all values of an array into a single value: [1, 2, 3, 4].reduce(function(a, b) { return a + b; }); ...

5.1 .some and .every allow a logical connective of Array values. While .some combines the return values with OR, .every combines them with AND. Examples for .some [false, false].some(function(value) { return value; }); // Result: false [false, true].some(function(value) { return value...

A lambda expression evaluated in a class' member function is implicitly a friend of that class: class Foo { private: int i; public: Foo(int val) : i(val) {} // definition of a member function void Test() { auto lamb = [](Foo &foo, int val) ...

Some regex flavors (Perl, PCRE, Oniguruma, Boost) only support fixed-length lookbehinds, but offer the \K feature, which can be used to simulate variable-length lookbehind at the start of a pattern. Upon encountering a \K, the matched text up to this point is discarded, and only the text matching th...

A newline can be included in a single-string or double-quoted string. Note that backslash-newline does not result in a newline, the line break is ignored. newline1=' ' newline2=" " newline3=$'\n' empty=\ echo "Line${newline1}break" echo "Line${newline2}break" ...

Variable substitutions should only be used inside double quotes. calculation='2 * 3' echo "$calculation" # prints 2 * 3 echo $calculation # prints 2, the list of files in the current directory, and 3 echo "$(($calculation))" # prints 6 Outside of doubl...

All the examples in this paragraph print the line !"#$&'()*;<=>? @[\]^`{|}~ A backslash quotes the next character, i.e. the next character is interpreted literally. The one exception is a newline: backslash-newline expands to the empty string. echo \!\"\#\$\&\'\(\)\*\;\...

The above type handler can be installed into SqlMapper using the AddTypeHandler method. SqlMapper.AddTypeHandler<IHtmlString>(new IHtmlStringTypeHandler()); Type inference allows you to omit the generic type parameter: SqlMapper.AddTypeHandler(new IHtmlStringTypeHandler()); There's als...

The & operator will perform a binary AND, where a bit is copied if it exists in both operands. That means: # 0 & 0 = 0 # 0 & 1 = 0 # 1 & 0 = 0 # 1 & 1 = 1 # 60 = 0b111100 # 30 = 0b011110 60 & 30 # Out: 28 # 28 = 0b11100 bin(60 & 30) # Out: 0b11100

The | operator will perform a binary "or," where a bit is copied if it exists in either operand. That means: # 0 | 0 = 0 # 0 | 1 = 1 # 1 | 0 = 1 # 1 | 1 = 1 # 60 = 0b111100 # 30 = 0b011110 60 | 30 # Out: 62 # 62 = 0b111110 bin(60 | 30) # Out: 0b111110

The ^ operator will perform a binary XOR in which a binary 1 is copied if and only if it is the value of exactly one operand. Another way of stating this is that the result is 1 only if the operands are different. Examples include: # 0 ^ 0 = 0 # 0 ^ 1 = 1 # 1 ^ 0 = 1 # 1 ^ 1 = 0 # 60 = 0b1111...

The << operator will perform a bitwise "left shift," where the left operand's value is moved left by the number of bits given by the right operand. # 2 = 0b10 2 << 2 # Out: 8 # 8 = 0b1000 bin(2 << 2) # Out: 0b1000 Performing a left bit shift of 1 is equivalent ...

The >> operator will perform a bitwise "right shift," where the left operand's value is moved right by the number of bits given by the right operand. # 8 = 0b1000 8 >> 2 # Out: 2 # 2 = 0b10 bin(8 >> 2) # Out: 0b10 Performing a right bit shift of 1 is equivalent...

if [[ $file1 -ef $file2 ]]; then echo "$file1 and $file2 are the same file" fi “Same file” means that modifying one of the files in place affects the other. Two files can be the same even if they have different names, for example if they are hard links, or if they are symbolic links...

if [[ -r $filename ]]; then echo "$filename is a readable file" fi if [[ -w $filename ]]; then echo "$filename is a writable file" fi if [[ -x $filename ]]; then echo "$filename is an executable file" fi These tests take permissions and ownership into a...