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What is the group() method in D language?

NDUKWE CHIDERA K.

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

The group() method will scan through an array of values and return an array of tuples that contains all consecutively placed unique characters in the scanned array and their number of appearances in the scanned array.

For example, the grouping of the array A = [3, 5, 5, 4, 5] will return something like this [(3,1), (5,2), (4,1), (5,1)], effectively grouping each consecutively recurring number with the count of its occurrences in A.

Syntax

group(predicate, array_to_group)

Parameters

Following parameters are required by the group() method.

  • predicate: An optional parameter. It is a binary predicate used to determine the equivalence of two elements. It has a default value of a==b. D language has a special way of writing predicates, so we have to clearly understand how this is done to change the default to custom.

  • array_to_group: This is the array whose elements are to be grouped.

Example

import std.algorithm.iteration;
import std.stdio;
void main() {
//declare an array value
int[] arr = [ 1, 2, 2, 2, 2, 3, 4, 4, 4, 5 ];
//print to screen the group of some values
writeln(group([2,4,4,4,5]));
//print to screen the group of array "arr"
writeln(group(arr));
}
The group() method in D language

Explanation

  • Lines 1–2: We import the necessary module.
  • Line 4: We start the main wrapper function.
  • Line 6: We declare an array arr and assign values to it.
  • Line 9: We print the group of some values to the screen.
  • Line 12: We print to screen the group of array arr.

RELATED TAGS

d language
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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