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Advanced Data Structures

How to check if a value exists in an Array in Ruby?

How to check if an Array contains a value or not?

Last Updated : 20 Feb, 2023

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There are many ways for checking whether the array contains any specific value or not, one of them is:

Examples:

Input: arr[] = {10, 30, 15, 17, 39, 13}, key = 17
Output: True

Input: arr[] = {3, 2, 1, 7, 10, 13}, key = 20
Output: False

Approach:

Using in-built functions: In C language there is no in-built function for searching

C++

#include <bits/stdc++.h> using namespace std;  int main() {     vector<int> v{ 10, 25, 15, 12, 14 };     int key = 15;      // Using inbuilt function 'find'     if (find(v.begin(), v.end(), key) != v.end())         cout << key << " is present in the array";     else         cout << key << " is not present in the array";     return 0; }

Java

/*package whatever // do not write package name here */  import java.io.*; import java.util.Arrays;  class GFG {     public static void main(String[] args)     {         Integer arr[] = { 10, 25, 15, 12, 14 };         int key = 15;          // Using inbuilt function 'contains'         boolean found = Arrays.asList(arr).contains(key);         if (found == true) {             System.out.println(                 key + " is present in the array");         }         else {             System.out.println(                 key + " is not present in the array");         }     } }

Python3

if __name__ == '__main__':     arr = [10, 25, 15, 12, 14]       key = 15       found = False          if key in arr:         found = True              if found == True:         print(key, end = " is present in the array")     else:         print(key, end = " is not present in the array")

C#

// C# Code for above approach using System;  public class GFG {     public static void Main(string[] args)     {         int []arr = { 10, 25, 15, 12, 14 };         int key = 15;          // Using inbuilt function 'contains'         bool found = Array.Exists(arr, x => x == key);         if (found == true) {             Console.WriteLine(key + " is present in the array");         }         else {             Console.WriteLine(key + " is not present in the array");         }     } }  // This code is contributed by AnkThon

PHP

<?php     $arr = array(10, 25, 15, 12, 14);     $key = 15;      if (in_array("$key", $arr)){         echo "$key is present in the array";      }      else{         echo "$key is not present in the array";      } ?>

JavaScript

<script>       const arr = [10, 25, 15, 12, 14];       const key = 15       if(arr.includes(key) == true){         console.log( key + " is present in the array");       }       else{         console.log( key + " is not present in the array");       } </script>

Output

15 is present in the array

Time Complexity: O(N)

Auxiliary Space: O(1)

Apart from these inbuilt functions, there are other methods that one can use like:

Linear search
Binary search
Ternary search, and
Other searching algorithms

How to check if a value exists in an Array in Ruby?

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prince_patel

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Article Tags :

Data Structures
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