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(Built-in) way in JavaScript to check if a string is a valid number
...10000') // false (This translates to Infinity, which is a number)
isNaN('foo') // true
isNaN('10px') // true
Of course, you can negate this if you need to. For example, to implement the IsNumeric example you gave:
function isNumeric(num){
return !isNaN(num)
}
To convert a string ...
Reverse a string in Python
...tep)
string[slice_obj]
A readable approach:
While ''.join(reversed('foo')) is readable, it requires calling a string method, str.join, on another called function, which can be rather relatively slow. Let's put this in a function - we'll come back to it:
def reverse_string_readable_answer(str...
Why is “except: pass” a bad programming practice?
...xample, if you know you might get a value-error on a conversion:
try:
foo = operation_that_includes_int(foo)
except ValueError as e:
if fatal_condition(): # You can raise the exception if it's bad,
logging.info(e) # but if it's fatal every time,
raise # you pro...
How do I get the name of a Ruby class?
...ce the class of a class is Class. Instead, you can just use name:
module Foo
class Bar
def self.say_name
puts "I'm a #{name}!"
end
end
end
Foo::Bar.say_name
output:
I'm a Foo::Bar!
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What is the best way to exit a function (which has no return value) in python before the function en
...
I would suggest:
def foo(element):
do something
if not check: return
do more (because check was succesful)
do much much more...
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How can I copy the output of a command directly into my clipboard?
...Jan 24 23:00:00 EST 2017
$ cb | cat
Tue Jan 24 23:00:00 EST 2017
$ cb > foo
$ cat foo
Tue Jan 24 23:00:00 EST 2017
Chaining
$ date | cb | tee updates.log
Tue Jan 24 23:11:11 EST 2017
$ cat updates.log
Tue Jan 24 23:11:11 EST 2017
# clipboard contains: Tue Jan 24 23:11:11 EST 2017
Copy via fi...
Java: Calling a super method which calls an overridden method
...to be some confusion. Let me try a different explanation.
When you invoke foo(), you actually invoke this.foo(). Java simply lets you omit the this. In the example in the question, the type of this is SubClass.
So when Java executes the code in SuperClass.method1(), it eventually arrives at this.m...
ROW_NUMBER() in MySQL
...@i+1 AS iterator,
t.*
FROM
tablename AS t,
(SELECT @i:=0) AS foo
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jQuery how to bind onclick event to dynamically added HTML element [duplicate]
...lates the object to handle
var staticObj = [
{ ID: '1', Name: 'Foo' },
{ ID: '2', Name: 'Foo' },
{ ID: '3', Name: 'Foo' }
];
staticObj[1].children = [
{ ID: 'a', Name: 'Bar' },
{ ID: 'b', Name: 'Bar' },
{ ID: 'c', Name: 'Bar' }
];
s...
How can you sort an array without mutating the original array?
...
You can use slice with no arguments to copy an array:
var foo,
bar;
foo = [3,1,2];
bar = foo.slice().sort();
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