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What are the Ruby Gotchas a newbie should be warned about? [closed]
...ue
"joe" === "bob" # false
# but ranges match any value they include
(1..10) === 5 # true
(1..10) === 19 # false
(1..10) === (1..10) # false (the range does not include itself)
# arrays just match equal arrays, but they do not match included values!
[1,2,3] === [1,2,3] # true
[1,2,3...
What is the most pythonic way to check if an object is a number?
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answered Aug 9 '10 at 15:31
Steven RumbalskiSteven Rumbalski
38.2k77 gold badges7575 silver badges107107 bronze badges
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An “and” operator for an “if” statement in Bash
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Try this:
if [ ${STATUS} -ne 100 -a "${STRING}" = "${VALUE}" ]
or
if [ ${STATUS} -ne 100 ] && [ "${STRING}" = "${VALUE}" ]
share
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improve t...
Replace a value if null or undefined in JavaScript
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Here’s the JavaScript equivalent:
var i = null;
var j = i || 10; //j is now 10
Note that the logical operator || does not return a boolean value but the first value that can be converted to true.
Additionally use an array of objects instead of one single object:
var options = {
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Numpy first occurrence of value greater than existing value
...rst occurrence are returned.") and doesn't save another list.
In [2]: N = 10000
In [3]: aa = np.arange(-N,N)
In [4]: timeit np.argmax(aa>N/2)
100000 loops, best of 3: 52.3 us per loop
In [5]: timeit np.where(aa>N/2)[0][0]
10000 loops, best of 3: 141 us per loop
In [6]: timeit np.nonzero(a...
How do I check if a number is a palindrome?
...d. Any algorithm you make will have to at least split the number into base-10 digits, which is 90% converted to a string anyway.
– Blorgbeard is out
Oct 13 '08 at 22:20
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What's the difference between eval, exec, and compile?
...ass a reference to exec:
>>> call_later(exec, 'print(42)', delay=1000)
File "<stdin>", line 1
call_later(exec, 'print(42)', delay=1000)
^
SyntaxError: invalid syntax
Which a pattern that someone might actually have used, though unlikely;
Or use it in a lis...
Is the “struct hack” technically undefined behavior?
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edited Sep 14 '10 at 17:24
answered Sep 14 '10 at 17:18
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Reversing a linked list in Java, recursively
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edited Feb 10 '19 at 21:59
piritocle
3144 bronze badges
answered Dec 10 '08 at 2:28
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Twig ternary operator, Shorthand if-then-else
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mgalicmgalic
1,50911 gold badge1010 silver badges77 bronze badges
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