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How-to articles, tricks, and solutions about SORTING

Group array by subarray values

In PHP, you can group an array of arrays (subarrays) by the value of a specific key in each subarray using the array_reduce() function.

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How can I sort a List alphabetically?

To sort a List alphabetically in Java, you can use the Collections.sort method and pass in your List as an argument.

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How do I sort a dictionary by key?

In Python, dictionaries are unordered collections of key-value pairs.

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How do I sort a dictionary by value?

You can use the sorted() function and pass it the dictionary, along with the key parameter set to a lambda function that returns the value from the dictionary.

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How do I sort a list of dictionaries by a value of the dictionary?

To sort a list of dictionaries by a value of the dictionary, you can use the sorted() function and specify the key parameter to be a lambda function that returns the value you want to sort by.

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How to convert a Collection to List?

In Java, you can convert a Collection (such as Set, Queue, etc.) to a List using the following methods:

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How to sort a HashMap in Java

To sort a HashMap in Java, you can use the TreeMap class, which is a Map implementation that maintains its entries in ascending order, sorted according to the keys.

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How to sort a list of objects based on an attribute of the objects?

You can use the sort method of a list and pass in a key argument, which is a function that takes an object and returns the value on which you want to sort the list.

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How to sort a List/ArrayList?

To sort a List or ArrayList in Java, you can use the sort method of the Collections class from the java.util package. The sort method takes a List and sorts it in ascending order according to the natural ordering of its elements.

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How to sort a list/tuple of lists/tuples by the element at a given index?

You can use the sorted() function with the key parameter to specify a function that extracts the element at the desired index.

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How to sort a Map<Key, Value> by values in Java

To sort a Map<Key, Value> by values in Java, you can create a custom comparator that compares the values and pass it to the sort() method of the Map.Entry class.

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How to sort an ArrayList in Java

To sort an ArrayList in Java, you can use the Collections.sort method.

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how to sort pandas dataframe from one column

To sort a Pandas DataFrame based on the values in a column, you can use the sort_values() method of the DataFrame.

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How to use Comparator in Java to sort

To use a Comparator in Java to sort a list of objects, you can use the Collections.sort method and pass it a List and a Comparator.

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Java Array Sort descending?

To sort an array in descending order in Java, you can use the Arrays.sort method and pass it a comparator that compares the elements in reverse order.

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Sort ArrayList of custom Objects by property

To sort an ArrayList of custom objects by a property, you can use the Collections.sort method and pass it a custom Comparator.

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Sorting HashMap by values

To sort a HashMap by values in Java, you can use the Map.Entry interface and the Comparator interface to create a comparator that compares the values in the map.

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Why is there no SortedList in Java?

There is no SortedList class in the Java standard library because the List interface already provides a way to store elements in a specific order.

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