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Why does ++[[]][+[]]+[+[]] return the string “10”?
... array ([]). Due to references it's wrong to say [[]][0] === [], but let's call the inner array A to avoid the wrong notation.
++ before its operand means “increment by one and return the incremented result”. So ++[[]][0] is equivalent to Number(A) + 1 (or +A + 1).
Again, we can simplify the m...
Two color borders
...ers for an embossed look. Can I do this on one element? I was hoping to avoid stacking two DOM elements with individual borders.
...
how to POST/Submit an Input Checkbox that is disabled?
... value will not appear into POST values. One of the strategy is to add an hidden field holding checkbox's value within the same form and read value back from that field
Simply change disabled to readonly
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Setting action for back button in navigation controller
...an't differentiate if the user pressed the back button or if you programatically called [self.navigationController popViewControllerAnimated:YES]
– Chase Roberts
Dec 27 '12 at 18:00
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How to remove all debug logging calls before building the release version of an Android app?
According to Google, I must " deactivate any calls to Log methods in the source code " before publishing my Android app to Google Play. Extract from section 3 of the publication checklist :
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AngularJS : Prevent error $digest already in progress when calling $scope.$apply()
...cess the watchers of all scopes.
To @dnc253's point, if you find yourself calling $digest or $apply frequently, you may be doing it wrong. I generally find I need to digest when I need to update the scope's state as a result of a DOM event firing outside the reach of Angular. For example, when a tw...
JSON and XML comparison [closed]
...type of an item (String/Number/Nested JSON Object) can be inferred syntactically, e.g:
myJSON = {"age" : 12,
"name" : "Danielle"}
The parser doesn't need to be intelligent enough to realise that 12 represents a number, (and Danielle is a string like any other). So in javascript we can d...
What is the meaning of “this” in Java?
...ss MyThisTest {
private int a;
public MyThisTest() {
this(42); // calls the other constructor
}
public MyThisTest(int a) {
this.a = a; // assigns the value of the parameter a to the field of the same name
}
public void frobnicate() {
int a = 1;
System.out.println(a); ...
What is the reason for performing a double fork when creating a daemon?
...e by setsid(). So, the first forked process becomes a session leader after calling setsid() and then we fork again so that the final, double-forked process is no longer a session leader. Other than the requirement of setsid() to be a session leader, you are spot on.
– dbmikus
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Conveniently map between enum and int / String
...return map.get(num);
}
}
This solution is nice and doesn't require 'fiddling with reflection' because it's based on the fact that all enum types implicitly inherit the Enum interface.
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