Explanation of [].slice.call in javascript?

I stumbled onto this neat shortcut for converting a DOM NodeList into a regular array, but I must admit, I don’t completely understand how it works: [].slice.call(document.querySelectorAll(‘a’), 0) So it starts with an empty array [], then slice is used to convert the result of call to a new array yeah? The bit I don’t … Read more

How can I call a function within a class?

I have this code which calculates the distance between two coordinates. The two functions are both within the same class. However, how do I call the function distToPoint in the function isNear? class Coordinates: def distToPoint(self, p): “”” Use pythagoras to find distance (a^2 = b^2 + c^2) “”” … def isNear(self, p): distToPoint(self, p) … Read more

When is the finalize() method called in Java?

In general it’s best not to rely on finalize() to do any cleaning up etc. According to the Javadoc (which it would be worth reading), it is: Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. As Joachim pointed out, this may never happen in the life … Read more

Call a Class From another class

Suposse you have Class1 public class Class1 { //Your class code above } Class2 and then you can use Class2 in different ways. Class Field public class Class1{ private Class2 class2 = new Class2(); } Method field public class Class1 { public void loginAs(String username, String password) { Class2 class2 = new Class2(); class2.invokeSomeMethod(); //your … Read more