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How to map and remove nil values in Ruby
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27
Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiom...
How to merge dictionaries of dictionaries?
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29 Answers
29
Active
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Cast List to List in .NET 2.0
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.NET 2.0 has the ConvertAll method where you can pass in a converter function:
List<int> l1 = new List<int>(new int[] { 1, 2, 3 } );
List<string> l2 = l1.ConvertAll<string>(delegate(int i) { return i.To...
Convert a float64 to an int in Go
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213
package main
import "fmt"
func main() {
var x float64 = 5.7
var y int = int(x)
fmt.Print...
How can I do an asc and desc sort using underscore.js?
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You can use .sortBy, it will always return an ascending list:
_.sortBy([2, 3, 1], function(num) {
return num;
}); // [1, 2, 3]
But you can use the .reverse method to get it descending:
var array = _.sortBy([2, 3, 1], function(num) {
return num;
});
console.log(array); // [1, 2, 3]
con...
How many characters can UTF-8 encode?
If UTF-8 is 8 bits, does it not mean that there can be only maximum of 256 different characters?
10 Answers
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How do I remove a property from a JavaScript object?
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How do you display JavaScript datetime in 12 hour AM/PM format?
How do you display a JavaScript datetime object in the 12 hour format (AM/PM)?
25 Answers
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Extracting specific columns from a data frame
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answered Apr 19 '15 at 21:19
Sam FirkeSam Firke
15k66 gold badges6565 silver badges8181 bronze badges
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How can I use pickle to save a dict?
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802
Try this:
import pickle
a = {'hello': 'world'}
with open('filename.pickle', 'wb') as handle:
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