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How to print binary tree diagram?
..., int level, int maxLevel) {
if (nodes.isEmpty() || BTreePrinter.isAllElementsNull(nodes))
return;
int floor = maxLevel - level;
int endgeLines = (int) Math.pow(2, (Math.max(floor - 1, 0)));
int firstSpaces = (int) Math.pow(2, (floor)) - 1;
int be...
Auto column width in EPPlus
...[Worksheet.Dimension.Address].AutoFitColumns();
Please note you need to call this method after filling the worksheet.
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How to programmatically send SMS on the iPhone?
Does anybody know if it's possible, and how, to programmatically send a SMS from the iPhone , with the official SDK / Cocoa Touch?
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Representing null in JSON
...s of type undefined.
JSON2 {"myCount": null}
In this case, myCount is actually defined, albeit its value is null. This is not the same as both "not undefined and not null", and if you were testing for one condition or the other, this might succeed whereas JSON1 would fail.
This is the definitive wa...
How to convert List to int[] in Java? [duplicate]
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Unfortunately, I don't believe there really is a better way of doing this due to the nature of Java's handling of primitive types, boxing, arrays and generics. In particular:
List<T>.toArray won't work because there's no conversion from Integer to int
You ...
HTML text input allow only numeric input
... quick way to set an HTML text input ( <input type=text /> ) to only allow numeric keystrokes (plus '.')?
62 Answers
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Assign pandas dataframe column dtypes
... of multiple columns in pd.Dataframe (I have a file that I've had to manually parse into a list of lists, as the file was not amenable for pd.read_csv )
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Iteration ng-repeat only X times in AngularJs
... This is an incredibly useful piece of code, but this does not actually satisfy the OP's question. He is simply looking for a way to repeat n times, and likely doesn't have an actual object to iterate over.
– SamHuckaby
Oct 16 '14 at 16:05
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Checking if a key exists in a JavaScript object?
... testing whether a key exists. What if the key exists but the value is actually undefined?
var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!
You should instead use the in operator:
"key" in obj // true, regardless of the actual value
If you want to check if a...
C# generic type constraint for everything nullable
...vs. the unhandiness of exceptions in a static constructor. Since you're really implementing a poor-mans static analyzer here, this exception should never be thrown except during development. Finally, even if you want to avoid static construction exceptions at all costs (unwise), then you should sti...