If we are not sure that the list is sorted, we could use the built-in min() function, to find the element which has the minimum distance from the specified number. >>> min(myList, key=lambda x:abs(x-myNumber)) 4 Note that it also works with dicts with int keys, like {1: “a”, 2: “b”}. This method takes O(n) time. … Read more
There are a lot of options: int x = 30; if (Enumerable.Range(1,100).Contains(x)) //true And indeed basic if more elegantly can be written with reversing order in the first check: if (1 <= x && x <= 100) //true Also, check out this SO post for regex options. Notes: LINQ solution is strictly for style points … Read more
>>> ‘{0:08b}’.format(6) ‘00000110’ Just to explain the parts of the formatting string: {} places a variable into a string 0 takes the variable at argument position 0 : adds formatting options for this variable (otherwise it would represent decimal 6) 08 formats the number to eight digits zero-padded on the left b converts the number … Read more
If it overflows, it goes back to the minimum value and continues from there. If it underflows, it goes back to the maximum value and continues from there. You can check that beforehand as follows: public static boolean willAdditionOverflow(int left, int right) { if (right < 0 && right != Integer.MIN_VALUE) { return willSubtractionOverflow(left, -right); … Read more
If you’re sure that this object is an Integer : int i = (Integer) object; Or, starting from Java 7, you can equivalently write: int i = (int) object; Beware, it can throw a ClassCastException if your object isn’t an Integer and a NullPointerException if your object is null. This way you assume that your … Read more
The idiomatic approach in Go is to write a for loop like this. for i := 1; i <= 10; i++ { fmt.Println(i) } There’s definitely advantages in ranges and they’re used in many other languages, but a Go design principle is to only introduce an abstraction if the benefits significantly outweigh the costs (including … Read more
Take a look at PEP-238: Changing the Division Operator The // operator will be available to request floor division unambiguously.
All integers that can be represented by floating point numbers have an exact representation. So you can safely use int on the result. Inexact representations occur only if you are trying to represent a rational number with a denominator that is not a power of two. That this works is not trivial at all! It’s … Read more
In Java, the ‘int’ type is a primitive, whereas the ‘Integer’ type is an object. In C#, the ‘int’ type is the same as System.Int32 and is a value type (ie more like the java ‘int’). An integer (just like any other value types) can be boxed (“wrapped”) into an object. The differences between objects … Read more
This is a common Javascript gotcha with a simple solution: Just specify the base, or ‘radix’, like so: parseInt(’08’,10); // 8 You could also use Number: Number(’08’); // 8