A few questions surrounding javascript arrays, in-built methods -

-

![enter image description here][1]

function setfood () {    var empty = [];    (var x=0; x<grid.width; x++) {       (var y=0; y>grid.height; y++) {            if (grid.get(x,y) === empty) {           empty.push({x:x, y:y});        }     }   } };

i watched video on youtube making snake game , came across whilst creator making function.

now have few questions want know answer can keep learning.

first: .get method? when searched it gave me results on jquery ever referenced jquery library anywhere javascript code? empty? pre programmed term javascript means same thing 0 or ``null? , lastly. why creator using brackets within push method? push empty array? , x:x , y:y mean?

i sorry questions. it's not have other people turn coding questions except coding community itself.

empty array, declared in var empty = []; empty, on other hand, variable. javascript case-sensitive it's not alias of empty[] array. it's common practice define constants in upper case it's clear are. variable contains value signifies empty cell.

empty.push({x:x, y:y}); pushing javascript object {x:x, y:y} on array. {} javascript syntax object. 1 contains x , y properties retrieved get() method of grid.

in case grid javascript object declared elsewhere in code. since code's not here can assume grid object holds status of grid on snake moving, , get() method retrieving status of element in grid.


Comments

Post a Comment

Popular posts from this blog

qt - Using float or double for own QML classes -

-
i've created components , helper methods using c++ , qt used in qml gui. of methods calculate gui elements (size, transformations, scene graph items creation). target arm 32 bit using opengl / eglfs render output. opengl using float , qml using real (defined double ). what should use in c++ do not lose precision? if use qreal ( double ) shouldn't lose precision. if git grep float in qtbase.git , can find out bit more: dist/changes-5.2.0-**************************************************************************** dist/changes-5.2.0-* important behavior changes * dist/changes-5.2.0-**************************************************************************** dist/changes-5.2.0- dist/changes-5.2.0- - qt compiled qreal typedef'ed double on dist/changes-5.2.0: platforms. qreal float on arm chipsets before. guarantees more dist/changes-5.2.0- consistent behavior between platforms qt supports, binary dist/chan...
Read more

Create Outlook appointment via C# .Net -

-
i need create outlook appointment using microsoft.office.interop.outlook , while can work locally on own workstation , works if run web application via server's browser, not work when connect server externally. hence, think might permission issue. i changed application pool identity " localsystem " don't access denied error. unfortunately, doesn't work. the app behaves if appointment created, appointment doesn't appear in outlook. here include file on top of aspx.cs page using outlook = microsoft.office.interop.outlook; here code using pop appointment. outlook.application apptapp = new outlook.application(); outlook.appointmentitem appt = apptapp.createitem(outlook.olitemtype.olappointmentitem) outlook.appointmentitem; appt.subject = txtfirstname.text + " " + txtlastname.text; appt.body = txtcomment.text; appt.alldayevent = false; appt.start = datetime.parse(txtreminderdate.text + " 8:00 am"); appt.end = datetime.p...
Read more

ios - Swift Array Resetting Itself -

-
i have 2 arrays: pointhistory , datehistory . have nstimer , , when timer runs out, action called. in action appending int pointhistory , , current date string datehistory . here timer action: func timeraction() { let steppervalue = int(stepper.value) employee.numberofpoints = steppervalue networking.saveemployee(employee, completion: { (error) -> void in if error != nil { let alert = uialertcontroller(title: "error", message: "there error updating \(self.employee.name)'s points", preferredstyle: .alert) let alertaction = uialertaction(title: "ok", style: .cancel, handler: nil) alert.addaction(alertaction) self.presentviewcontroller(alert, animated: true, completion: nil) } }) var dateformatter = nsdateformatter() dateformatter.dateformat = "mm-dd-yyyy" dateformatter.timezone = nstimezone.localtimezone() var date = nsdate() var ...
Read more