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Fastest way to iterate over all the chars in a String
...e now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'charAt' and field access. It appears that the jvm is sufficiently optimized to inline and streamline any 'string.charAt(n)' calls.
THIRD UPDAT...
Index all *except* one item in python
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115
For a list, you could use a list comp. For example, to make b a copy of a without the 3rd ele...
How to initialize an array in one step using Ruby?
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192
You can use an array literal:
array = [ '1', '2', '3' ]
You can also use a range:
array = ...
How exactly does tail recursion work?
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169
The compiler is simply able to transform this
int fac_times (int n, int acc) {
if (n == 0...
Drop rows with all zeros in pandas data frame
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12 Answers
12
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Convert Elixir string to integer or float
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154
Check Integer.parse/1 and Float.parse/1.
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How can I check if a string represents an int, without using try/except?
... any way to tell whether a string represents an integer (e.g., '3' , '-17' but not '3.14' or 'asfasfas' ) Without using a try/except mechanism?
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How do I compare version numbers in Python?
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10 Answers
10
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Expand a random range from 1–5 to 1–7
Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.
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Determine the data types of a data frame's columns
...se ?str(). To explore some examples, let's make some data:
set.seed(3221) # this makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
X3=letters[1:5])
@...