Tutorial by Topics: operators

Operators are used to assign or compare values. They consist of a single symbol or keyword and are usually sandwiched between a left and a right value. For example: right = left. Operators are intrinsic to the language (such as =), and not functions such as those provided by System.Math.

Operators are methods Most operators are actually just methods, so x + y is calling the + method of x with argument y, which would be written x.+(y). If you write a method of your own having semantic meaning of a given operator, you can implement your variant in the class. As a silly example:...

The Elvis operator evaluates based on Groovy-Truth of the condition-part.

Nearly all operators in R are really functions. For example, + is a function defined as function (e1, e2) .Primitive("+") where e1 is the left-hand side of the operator and e2 is the right-hand side of the operator. This means it is possible to accomplish rather counterintuitive effect...

Operators are evaluated in the following order: Mathematical operators Bitwise operators Concatenation operators Comparison operators Logical operators Operators with matching precedence are evaluated from left to right. The default order can be overridden by using parentheses ( and ) t...

{ $set: { <field1>:<value1>, <field2>:<value2>, ... } } parametersMeaningfieldNameField will be updated :{name: 'Tom'}targetVauleValue will be assigned to the field :{name: 'Tom'} Reference for $set operator: $set on offical website

Most Haskell functions are called with the function name followed by arguments (prefix notation). For functions that accept two arguments like (+), it sometimes makes sense to provide an argument before and after the function (infix).

Most operators in Rust can be defined ("overloaded") for user-defined types. This can be achieved by implementing the respective trait in std::ops module.

In VFP, operators are grouped into those: Numeric Operators Logical Operators Character Operators Date and Time Operators Relational Operators Also there are operators, implemented as functions (such as bitwise operations, object comparison ...). We will look into each by example.

Retry and RetryWhen can be used to attempt to recover Observables that might have errors in their stream. .retry(n: number): Observable n: retry will attempt the source Observable this many times. .retryWhen(receives: notificationHandler, the: scheduler): Observable receives: an Obs...