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get size of json object
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edited Feb 13 '16 at 21:02
Fergus
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Replace a value if null or undefined in JavaScript
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edited Apr 15 '13 at 12:56
MojoFilter
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jQuery form serialize - empty string
...x Kling
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How to cherry pick from 1 branch to another
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edited Dec 13 '19 at 16:38
Paolo
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a...
What is purpose of the property “private” in package.json?
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answered Sep 6 '11 at 4:31
aceace
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What Every Programmer Should Know About Memory?
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
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Why is reading lines from stdin much slower in C++ than Python?
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einpoklum
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answered Feb 21 '12 at 3:24
Vaughn CatoVaugh...
Hidden features of Ruby
...product| product.modulo(factor).zero?}
end
case number
when multiple_of(3)
puts "Multiple of 3"
when multiple_of(7)
puts "Multiple of 7"
end
share
edited Dec 8 '...
How do you delete a column by name in data.table?
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Any of the following will remove column foo from the data.table df3:
# Method 1 (and preferred as it takes 0.00s even on a 20GB data.table)
df3[,foo:=NULL]
df3[, c("foo","bar"):=NULL] # remove two columns
myVar = "foo"
df3[, (myVar):=NULL] # lookup myVar contents
# Method 2a -- A saf...