查找数组中是否存在数字

Question

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?

Answer 1

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!"));

Answer 2

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!"));

Answer 3

One year later, but try this one!

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

Answer 4

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]))

Answer 5

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'));

Answer 6

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!!

Answer 7

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);

}

Answer 8

 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]));

Answer 9

Array.prototype.some() is the only correct way of doing this.

 const sevenBoom = arr => arr.some(n => n == 7)? "Boom:". "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]))

Answer 10

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));
    }}

Answer 11

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));
    }
}