Finding if number exists in array

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Create a function that takes an array of numbers and return "Boom!" if the number 7 appears in the array. Otherwise, return "there is no 7 in the array".

function sevenBoom(arr) {

   if (arr.includes(7)) {

      return "Boom!"

   } 

  return "there is no 7 in the array"

}

TESTS

Test.assertEquals(sevenBoom([2, 6, 7, 9, 3]), "Boom!")
Test.assertEquals(sevenBoom([33, 68, 400, 5]), "there is no 7 in the array")
Test.assertEquals(sevenBoom([86, 48, 100, 66]), "there is no 7 in the array")
Test.assertEquals(sevenBoom([76, 55, 44, 32]), "Boom!")
Test.assertEquals(sevenBoom([35, 4, 9, 37]), "Boom!")

The last 2 tests are failing, im assuming that is the case because it's looking for a 7, not just having a 7 in the number itself.

How could I correct this?

NOT A DUPLICATE

This has nothing to do with substrings or strings. Why do people like marking things as duplicate so much?

arrays javascript
10 Answers

Here is one way using Regex in combination Array.prototype.join to match only 7 number:

[35, 4, 9, 37,7].join().match(/\b7\b/) !== null

This searches for only 7 within your array joined

/\b7\b/

Then all it is required is:

function sevenBoom(arr) {
       var has7 = arr.join().match(/\b7\b/) !== null;
       if (has7) { return "Boom!" } 
    
      return "there is no 7 in the array"
    
    }

    console.log(sevenBoom([2, 6, 7, 9, 3], "Boom!"))
    console.log(sevenBoom([33, 68, 400, 5], "there is no 7 in the array"))
    console.log(sevenBoom([86, 48, 100, 66], "there is no 7 in the array"))
    console.log(sevenBoom([76, 55, 44, 32], "Boom!"))
    console.log(sevenBoom([35, 4, 9, 37], "Boom!"));

user_19599480

Solution without regular expressions: 

function sevenBoom(arr) {
    for(let el of arr) {
        if(el.toString().split('').includes('7')) {
            return "Boom!"
        }
    }
    return "there is no 7 in the array"
}

console.log(sevenBoom([2, 6, 7, 9, 3], "Boom!"))
console.log(sevenBoom([33, 68, 400, 5], "there is no 7 in the array"))
console.log(sevenBoom([86, 48, 100, 66], "there is no 7 in the array"))
console.log(sevenBoom([76, 55, 44, 32], "Boom!"))
console.log(sevenBoom([35, 4, 9, 37], "Boom!"));

user_108164610

One year later, but try this one!

const sevenBoom = arr => /7/.test(arr) ? 'Boom!' : 'there is no 7 in the array';
user_143497470

We can also do this using Array.prototype.some which will return true immediately once the number in the array includes 7:

function sevenBoom(arr) {
   if (arr.some(num => `${num}`.includes('7'))) {
      return "Boom!"
   } 
  return "there is no 7 in the array"
}

console.log(sevenBoom([2, 6, 7, 9, 3]))
console.log(sevenBoom([33, 68, 400, 5]))
console.log(sevenBoom([86, 48, 100, 66]))
console.log(sevenBoom([76, 55, 44, 32]))
console.log(sevenBoom([35, 4, 9, 37]))

user_38887660

Or, taken to the extreme in ES6 notation. "spot the value 7":

[[2, 6, 7, 9, 3],[33, 68, 400, 5],[86, 48, 100, 66],[76, 55, 44, 32],[35, 7, 9, 37]]
.forEach(arr=>console.log(arr.toString(),arr.some(el=>el==7)?'boom, value==7':'nope'));

Just realized the number 7 is to be spotted as a digit and not the total number. "spot the digit 7":

[[2, 6, 7, 9, 3],[33, 68, 400, 5],[86, 48, 100, 66],[76, 55, 44, 32],[35, 7, 9, 37]]
.forEach(arr=>console.log(arr.toString(),arr.toString().match(/7/)?'boom, digit 7 found':'nope'));

user_26100610

Create a function that takes an array of numbers and return "Boom!" if the digit 7 appears in the array. Otherwise, return "there is no 7 in the array".

const sevenBoom = (arr) => {
  let statement = "there is no 7 in the array";
  arr.forEach((element) => {
    element = element.toString();
    if (element.length === 1) {
      if (element == 7) {
        statement = "Boom!";
      }
    } else if (element.length > 1) {
      element = element.split("");
      // console.log(element);
      for (let i = 0; i < element.length; i++) {
        // console.log(typeof element[i]);
        if (element[i] == 7) {
          // console.log(typeof element[i]);
          statement = "Boom!";
        }
      }
    }
  });
  return statement;
};

// console.log(sevenBoom([1, 2, 3, 4, 5, 6, 7]));
// console.log(sevenBoom([5, 25, 77]));
// console.log(sevenBoom([1, 2, 4]));
// console.log(sevenBoom([42, 76, 55, 44, 32]));
// console.log(sevenBoom([2, 55, 60, 97, 86]));

Simple code using array's functions and loops please let me know if this was helpful to you!!

user_145074970

private static void boom(int[] numbers){

    String boom = "Boom!";
    String noseven ="there is no 7 in the array";
    String string_n;
    char[] chArray = new char[30] ;
    
    int numLenth = numbers.length;
    int y=0;
                    
    for (int j = 0 ; j < numLenth; j++)
        
    {
        
        string_n = String.valueOf(numbers[j]);
        for (int i = 0 ; i < string_n.length(); i++)
            
            
        {
            chArray[i] = string_n.charAt(i);
            
            
            
        if (chArray[i] == '7' )
            y = 1 ;
            
        }
        
        }
    
    
    

    if (y == 1)
        System.out.println(boom);
    else
        System.out.println(noseven);
    
}

public static void main(String[] args) {

    int[] arrayofnum1 = {1,2,0,4,5,6,9,8,9};
    int[] arrayofnum2 = {7,17,27,5,6,3,12354,1234578};
    int[] arrayofnum3 = {12345689,6532198,65632198};
    
    
    boom(arrayofnum1);
    boom(arrayofnum2);
    boom(arrayofnum3);

}

user_180935960 

function sevenBoom(arr) {
    let regex = /7/g;
    if(arr.toString().match(regex)){
        return "Boom!";
    }else{
        return "there is no 7 in the array";
    }
}
console.log(sevenBoom([2, 6, 7, 9, 3]))
console.log(sevenBoom([33, 68, 400, 5]))
console.log(sevenBoom([86, 48, 100, 66]))
console.log(sevenBoom([76, 55, 44, 32]))
console.log(sevenBoom([35, 4, 9, 37]))

function sevenBoom(arr) {  
    let regex = /7/g;
    if(arr.toString().match(regex)){
        return "Boom!";
    }else{
        return "there is no 7 in the array";
    }
}
console.log(sevenBoom([2, 6, 7, 9, 3]));
console.log(sevenBoom([33, 68, 400, 5]));
console.log(sevenBoom([86, 48, 100, 66]));
console.log(sevenBoom([76, 55, 44, 32]));
console.log(sevenBoom([35, 4, 9, 37]));
user_167242770 
package ArrayPractice;
import java.util.Scanner;
public class Question3 {
    public String sevenBoom(int [] test) {
        for(int i=0;i<test.length;i++){
            if(test[i]==7){
                return "Boom";}
            if(test[i]>=10){
                StringBuilder sb= new StringBuilder();
                sb.append(test[i]);
                String temp= sb.toString();
                for(int v=0;v<temp.length();v++){
                    char c= temp.charAt(v);
                    if(c=='7'){
                        return "Boom";
                    }}}
        }return "None of the items contain 7 within them.";}
    public static void main(String[] args) {
        System.out.println("Enter the array Range: ");
        Scanner sc= new Scanner(System.in);
        int i= sc.nextInt();
        int [] testing= new int[i];
        for(int x=0;x<testing.length;x++){
            System.out.println("Enter the array number: "+x);
            testing[x]= sc.nextInt();}
        Question3 question3= new Question3();
        System.out.println(question3.sevenBoom(testing));
    }}
user_62801350 
package ArrayPractice;

import java.util.Scanner;

public class Question4 {
    public String sevenBoom(int[] test) {
        for (int i = 0; i < test.length; i++) {
            StringBuilder sb = new StringBuilder();
            sb.append(test[i]);
            String temp = sb.toString();
            if (temp.contains("7")) {
                return "Boom";
            }
        }
        return "None of the items contain 7 within them.";
    }

    public static void main(String[] args) {
        System.out.println("Enter the array Range: ");
        Scanner sc = new Scanner(System.in);
        int i = sc.nextInt();
        int[] testing = new int[i];
        for (int x = 0; x < testing.length; x++) {
            System.out.println("Enter the array number: " + x);
            testing[x] = sc.nextInt();
        }
        Question4 question3 = new Question4();
        System.out.println(question3.sevenBoom(testing));
    }
}
user_62801350
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