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What are the Ruby Gotchas a newbie should be warned about? [closed]
...s strict: 0, "" and [] are all evaluated to true. In C, the expression 0 ? 1 : 0 evaluates to 0 (i.e. false). In Ruby, however, it yields 1, as all numbers evaluate to true; only nil and false evaluate to false. A corollary to this rule is that Ruby methods by convention — for example, regular-exp...
How can I get the behavior of GNU's readlink -f on a Mac?
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readli...
Get the index of the nth occurrence of a string?
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Which iOS app version/build number(s) MUST be incremented upon App Store release?
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10 Answers
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Print list without brackets in a single row
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12 Answers
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Lambda function in list comprehensions
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271
The first one creates a single lambda function and calls it ten times.
The second one doesn't ca...
Best way to find if an item is in a JavaScript array? [duplicate]
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As of ECMAScript 2016 you can use includes()
arr.includes(obj);
If you want to support IE or other older browsers:
function include(arr,obj) {
return (arr.indexOf(obj) != -1);
}
EDIT:
This will not work on IE6, 7 or 8 though. The bes...
Finding ALL duplicate rows, including “elements with smaller subscripts”
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130
duplicated has a fromLast argument. The "Example" section of ?duplicated shows you how to use...
pandas dataframe columns scaling with sklearn
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I am not sure if previous versions of pandas prevented this but now the following snippet works ...