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How do I find out if first character of a string is a number?
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Character.isDigit(string.charAt(0))
Note that this will allow any Unicode digit, not just 0-9....
How to output only captured groups with sed?
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answered May 6 '10 at 2:39
Paused until further notice.Paused until further notice.
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Seeding the random number generator in Javascript
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edited May 23 '17 at 12:02
Community♦
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answered Feb 6 '09 at 17:42
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Can dplyr package be used for conditional mutating?
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220
Use ifelse
df %>%
mutate(g = ifelse(a == 2 | a == 5 | a == 7 | (a == 1 & b == 4), 2,
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iOS White to Transparent Gradient Layer is Gray
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clearColor has a black color channel with an alpha of 0, so I had to use
[UIColor colorWithWhite:1 alpha:0]
and it works fine.
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Constructor overload in TypeScript
...tor overloading in TypeScript. On page 64 of the language specification (v 0.8), there are statements describing constructor overloads, but there wasn't any sample code given.
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How to round a number to significant figures in Python
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20 Answers
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How to iterate through two lists in parallel?
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edited Jun 9 '19 at 20:46
Tobias Kolb
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answered Nov 2 '09 at...
Ruby, remove last N characters from a string?
..._suffix!('123') # => "abc"
It's even significantly faster (almost 40% with the bang method) than the top answer. Here's the result of the same benchmark:
user system total real
chomp 0.949823 0.001025 0.950848 ( 0.951941)
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How to calculate the number of occurrence of a given character in each row of a column of strings?
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#2 2 magic 1
#3 3 not 0
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