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Why does ++[[]][+[]]+[+[]] return the string “10”?
...at +[] === 0. + converts something into a number, and in this case it will come down to +"" or 0 (see specification details below).
Therefore, we can simplify it (++ has precendence over +):
++[[]][0]
+
[0]
Because [[]][0] means: get the first element from [[]], it is true that:
[[]][0] returns...
Is it possible to make abstract classes in Python?
...you need it? If the class is already established as abstract shouldn't the compiler/interpret know that all the methods are from the abstract class in question?
– Charlie Parker
Mar 17 '14 at 3:30
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Get nth character of a string in Swift programming language
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Why is this not built-in?
The error message says "see the documentation comment for discussion". Apple provides the following explanation in the file UnavailableStringAPIs.swift:
Subscripting strings with integers is not available.
The concept of "the ith character in a string" has
dif...
When should I use the “strictfp” keyword in java?
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What are the Ruby Gotchas a newbie should be warned about? [closed]
...in a boolean expression.
Versions prior to 1.9 lack a character data type (compare to C, which provides type char for characters). This may cause surprises when slicing strings: "abc"[0] yields 97 (an integer, representing the ASCII code of the first character in the string); to obtain "a" use "abc"...
Is nested function a good approach when required by only one function? [closed]
... concept -- in actual use what do_it() does would presumably be a bit more complicated than what can be handled by some arithmetic in a single return statement.
– martineau
Sep 2 '14 at 13:07
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How to use hex color values
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#ffffff are actually 3 color components in hexadecimal notation - red ff, green ff and blue ff. You can write hexadecimal notation in Swift using 0x prefix, e.g 0xFF
To simplify the conversion, let's create an initializer that takes integer (0 - 255) va...
How can I change an element's class with JavaScript?
...nt attributes (such as onclick="this.className+=' MyClass'") this is not recommended behaviour. Especially on larger applications, more maintainable code is achieved by separating HTML markup from JavaScript interaction logic.
The first step to achieving this is by creating a function, and calling ...