Tutorial by Topics: operator

Rx.Observable.prototype.map(selector, [thisArg]) Rx.Observable.prototype.select(selector, [thisArg]) Parameter, TypeDetailsselector, Function or ObjectTransform function to apply to each source element or an element to yield. If selector is a function, it is called with the following inform...
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...
The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.
The spaceship operator is used for comparing two expressions. For example, $a <=> $b returns -1, 0 or 1 when $a is respectively less than, equal to, or greater than $b. Comparisons are performed according to PHP's usual type comparison rules.

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