ESP32 cpplinq: Removing duplicate elements of array

In this esp32 tutorial we will learn how to remove duplicate elements from an array of integers, using cpplinq. The tests shown on this tutorial were performed using an ESP32 board from DFRobot.

Introduction

In this esp32 tutorial we will learn how to remove duplicate elements from an array of integers, using cpplinq.

We will be using the ESP32 as target board and we will also use the Arduino core to program the device.

The tests shown on this tutorial were performed using an ESP32 board from DFRobot.

The code

The first thing we will do is including the cpplinq library. This way we will have access to the cpplinq operator that allows to remove duplicate elements from an array.

#include "cpplinq.hpp"

Then we will declare the use of the cpplinq namespace, like we have been doing in the previous tutorials. This way, we don’t need to use the C++ scope resolution operator, making the syntax shorter.

using namespace cpplinq;

In the Arduino setup function, we will start by opening a serial connection. That way, when testing the code, we can check the results on the Arduino IDE serial monitor.

Serial.begin(115200);

Then we will declare an array of integers with some duplicate values, so we can later remove them.

int ints[] = {1,1,1,2,2,3,4,5,6,7,7,7,7};

As we have been doing in the previous tutorials using cpplinq, the first thing we need to do before applying operators is converting the array to a range object.

from_array(ints)

distinct()

auto result = from_array(ints)
               >> distinct()
               >> to_vector();

for(int i=0; i<result.size(); ++i){
    Serial.print(result[i]);
    Serial.print("|");
}

#include "cpplinq.hpp"
  
using namespace cpplinq;
  
void setup() {
  Serial.begin(115200);
    
  int ints[] = {1,1,1,2,2,3,4,5,6,7,7,7,7};
    
  auto result = from_array(ints)
               >> distinct()
               >> to_vector();
                 
  for(int i=0; i<result.size(); ++i){
    Serial.print(result[i]);
    Serial.print("|");
  }
}
  
void loop() {}