filter Archives - Page 2 of 2

Java 8 Streams: multiple filters vs. complex condition

Sometimes you want to filter a Stream with more than one condition: myList.stream().filter(x -> x.size() > 10).filter(x -> x.isCool()) ... or you could ...

May 17, 2022
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How to use filter, map, and reduce in Python 3

filter, map, and reduce work perfectly in Python 2. Here is an example: >>> def f(x): return x % 2 != 0 and ...

May 11, 2022
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File input ‘accept’ attribute – is it useful?

Implementing a file upload under html is fairly simple, but I just noticed that there is an ‘accept’ attribute that can be added ...

May 11, 2022
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Why is `[` better than `subset`?

When I need to filter a data.frame, i.e., extract rows that meet certain conditions, I prefer to use the subset function: subset(airquality, Month ...

May 6, 2022
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Filter object properties by key in ES6

Let’s say I have an object: { item1: { key: 'sdfd', value:'sdfd' }, item2: { key: 'sdfd', value:'sdfd' }, item3: { key: 'sdfd', ...

May 6, 2022
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How to filter empty or NULL names in a QuerySet?

I have first_name, last_name & alias (optional) which I need to search for. So, I need a query to give me all the ...

May 1, 2022
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How to filter a Java Collection (based on predicate)?

I want to filter a java.util.Collection based on a predicate. 29 s 29 Java 8 (2014) solves this problem using streams and lambdas ...

April 25, 2022
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Remove rows with all or some NAs (missing values) in data.frame

I’d like to remove the lines in this data frame that: a) contain NAs across all columns. Below is my example data frame. ...

April 16, 2022
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