Thequestion is answered pretty thoroughly in the official documentation. Have you read it? The same goes for scope functions. There are also several very low level articles about scope functions (just enter kotlin scope functions in google). StackOverflow is not the best place for learning kotlin. The starting point is the official documentation, then google for articles.
The this identified points to the enclosing instance of the class. And it could be committed since we are inside of this instance. The receiver works the same way. The function called with a receiver is not actually inside the class, but public methods and field of the object could be called as though as from the inside.
So the reciever is the part in an extension function before the function name. It pretends to be the class the function belongs to. It can either be accessed with this but same as for normal methods you can omitt the this keyword for properties like this.foo or function calls like this.bar().
Function types can optionally have an additional receiver type, which is specified before a dot in the notation: the type A.(B) -> C represents functions that can be called on a receiver object of A with a parameter of B and return a value of C . Function literals with receiver are often used along with these types.
I am not sure if it will help you, but you can look through my article on more philosophical aspects of receivers. The idea is that in kotlin, the function not only have its arguments, but it also has a scope or context, where it is called. You have the same thing in any language that have objects with member functions, but in Kotlin you can detach the function from object and keep the reference to the context in the receiver. The receiver is designed that way in order for internal function logic to be the same when called inside and outside of the object.
If you do not specify a parameter in a single-parameter lambda, the parameter is implicitly given the name it. Just like agent before, it is bound to the value of the receiver of the let method call: agentFactory.createAgent().
(Notice the rescoping there. This basically captures the current value of thing, checks if it is not null, and then runs the method on it. This is what provides the power of extension scoping functions and makes stuff like thing?.let a really idiomatic way to do a null check and capture the value in just a couple characters in a clear way.)
When you call foo.bar(), the object foo is the receiver of the function call. This means that in the context of bar() there is a magic parameter called this which contains a reference to the object foo. The function bar() can use that to access properties and call functions in foo. For example, if foo has a property baz then from within the function bar() you could access it with this.baz. Becuase this is magic, you can leave it out and the compiler will know what you are talking about, so from within bar() you could directly reference baz without the this. part.
The . and ?. operators are used for calling methods and referring to properties. An expression using ?. will evaluate to null if the expression on the left is null and it will do so without evaluating the method arguments (if any).
This may be a bit unintuitive, as actually the cat and the politician are the ones doing things, not passive as one may expect a receiver to be, but I suppose programmers liked to be the ones giving the orders which were then received (and executed) by obedient objects.
The 3Dconnexion Universal Receiver is the solid link between your computer and up to five 3Dconnexion wireless products. With only one small USB receiver you can easily pair any 3Dconnexion product for a reliable, wireless connection.
Simply pop the USB receiver into your PC or Mac, and enjoy a cord free environment with the performance and reliability of a wired one. Its 2.4GHz technology ensures a stable connection without any signal droppings. Due to its small size it can be kept in your notebooks USB port while you switch location without risking damage.
The Office of the Special Deputy Receiver (OSD) assists the Illinois Director of Insurance in discharging his duties as Receiver under the Illinois Insurance Code. The primary responsibilities of the Receiver are to marshal the assets of companies in liquidation; reduce those assets to cash; and to pay the cash to persons having claims against the liquidated company as directed in the Illinois Insurance Code.
The Director is empowered among other matters to examine insurance companies, service plans, and health maintenance organizations (HMO's). If, as a result of those examinations, it is determined that any such domestic insurance company, service plan or HMO poses a current or potential financial hazard to the public, its policyholders or its creditors, the Director may, in addition to certain administrative orders, seek an order from a court to conserve and seize the assets, books and records of the subject entity to determine its true financial condition. The Director must then, upon the advice of counsel, examiners and OSD, further determine whether the entity should be released from court supervision because its problems have been resolved, or instead be rehabilitated or liquidated pursuant to the provisions of Article XIII and XIII of the Illinois Insurance Code. The Director is the statutorily designated receiver of such companies.
For the purpose of managing such receiverships, the Director, as receiver, may appoint accountants, consultants, agents, attorneys and a Special Deputy pursuant to Section 202 of the Illinois Insurance Code.
The Special Deputy and OSD function as agents of the Director, acting solely as the statutorily designated receiver. All operating and personnel expenses incurred by the OSD are paid out of the assets of the companies under the control of the Special Deputy pursuant to statute as receivership administrative expenses through a time accounting allocation system. All expenses are reported to and approved by the supervising court for each estate through either special petition or the companies' receipts and disbursements reports as filed with the court.
In the original Smalltalk terminology, methods on "objects" were instead refered to as messages to objects (i.e. you didn't call a method on object foo, you sent object foo a message). So foo.blah is sending the "blah" message, which the "foo" object is receiving; "foo" is the receiver of "blah".
Alertmanager is configured viacommand-line flags and a configuration file.While the command-line flags configure immutable system parameters, theconfiguration file defines inhibition rules, notification routing andnotification receivers.
Alertmanager can reload its configuration at runtime. If the new configurationis not well-formed, the changes will not be applied and an error is logged.A configuration reload is triggered by sending a SIGHUP to the process orsending an HTTP POST request to the /-/reload endpoint.
The global configuration specifies parameters that are valid in all otherconfiguration contexts. They also serve as defaults for other configurationsections. The other top-level sections are documented below on this page.
Every alert enters the routing tree at the configured top-level route, whichmust match all alerts (i.e. not have any configured matchers).It then traverses the child nodes. If continue is set to false, it stopsafter the first matching child. If continue is true on a matching node, thealert will continue matching against subsequent siblings.If an alert does not match any children of a node (no matching child nodes, ornone exist), the alert is handled based on the configuration parameters of thecurrent node.
All fields are lists. Within each non-empty list, at least one element must be satisfied to matchthe field. If a field is left unspecified, any value will match the field. For an instant of timeto match a complete time interval, all fields must match.Some fields support ranges and negative indices, and are detailed below. If a time zone is notspecified, then the times are taken to be in UTC.
weekday_range: A list of days of the week, where the week begins on Sunday and ends on Saturday.Days should be specified by name (e.g. 'Sunday'). For convenience, ranges are also acceptedof the form : and are inclusive on both ends. For example:['monday:wednesday','saturday', 'sunday']
days_of_month_range: A list of numerical days in the month. Days begin at 1.Negative values are also accepted which begin at the end of the month,e.g. -1 during January would represent January 31. For example: ['1:5', '-3:-1'].Extending past the start or end of the month will cause it to be clamped. E.g. specifying['1:31'] during February will clamp the actual end date to 28 or 29 depending on leap years.Inclusive on both ends.
month_range: A list of calendar months identified by a case-insensitive name (e.g. 'January') or by number,where January = 1. Ranges are also accepted. For example, ['1:3', 'may:august', 'december'].Inclusive on both ends.
location: A string that matches a location in the IANA time zone database. Forexample, 'Australia/Sydney'. The location provides the time zone for the timeinterval. For example, a time interval with a location of 'Australia/Sydney' thatcontained something like:
You may also use 'Local' as a location to use the local time of the machine whereAlertmanager is running, or 'UTC' for UTC time. If no timezone is provided, the timeinterval is taken to be in UTC time.Note: On Windows, only Local or UTC aresupported unless you provide a custom time zone database using the ZONEINFOenvironment variable.
Inhibition allows muting a set of alerts based on the presence of another set ofalerts. This allows establishing dependencies between systems or services such thatonly the most relevant of a set of interconnected alerts are sent out during an outage.
An inhibition rule mutes an alert (target) matching a set of matcherswhen an alert (source) exists that matches another set of matchers.Both target and source alerts must have the same label valuesfor the label names in the equal list.
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