How to resolve the algorithm List comprehensions step by step in the jq programming language

Published on 12 May 2024 09:40 PM
#Jq

How to resolve the algorithm List comprehensions step by step in the jq programming language

Table of Contents

Problem Statement

A list comprehension is a special syntax in some programming languages to describe lists. It is similar to the way mathematicians describe sets, with a set comprehension, hence the name. Some attributes of a list comprehension are:

Write a list comprehension that builds the list of all Pythagorean triples with elements between   1   and   n. If the language has multiple ways for expressing such a construct (for example, direct list comprehensions and generators), write one example for each.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm List comprehensions step by step in the jq programming language

Source code in the jq programming language

def triples(n):
  range(1;n+1) as $x | range($x;n+1) as $y | range($y;n+1) as $z
  | select($x*$x + $y*$y == $z*$z)
  | [$x, $y, $z] ;

# listof( stream; criterion) constructs an array of those 
# elements in the stream that satisfy the criterion
def listof( stream; criterion): [ stream|select(criterion) ];

def listof_triples(n):
  listof( range(1;n+1) as $x | range($x;n+1) as $y | range($y;n+1) as $z 
          | [$x, $y, $z]; 
          .[0] * .[0] +  .[1] * .[1] ==  .[2] * .[2] ) ;

listof_triples(20)

  

You may also check:How to resolve the algorithm Koch curve step by step in the Lambdatalk programming language
You may also check:How to resolve the algorithm Identity matrix step by step in the Delphi programming language
You may also check:How to resolve the algorithm 99 bottles of beer step by step in the hexiscript programming language
You may also check:How to resolve the algorithm CRC-32 step by step in the JavaScript programming language
You may also check:How to resolve the algorithm Runtime evaluation/In an environment step by step in the PHP programming language