I have a prob to solve, I have to use a loop to step through each position in an array of " winning numbers"to check whether the variable customer number (input from keyboard) matches any of the winning numbers. I must use a For loop to step through each position in the winning numbers array and to pare the customer number to each number the array contains. I cannot use any method to achieve this problem Thanks for your help! here what I did so far:

var customerNumbers = prompt("Enter your number:");
var winningNumbers = [12, 17, 24, 37, 38, 43];    

for (var i = 0; i < winningNumbers.length; i++) {

    if (customerNumbers == 12 || //condition determinates the winning numbers
        customerNumbers == 17 ||
        customerNumbers == 24 ||
        customerNumbers == 37 ||
        customerNumbers == 38 ||
        customerNumbers == 43)
        alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "We have a match and a winner!");
} else {
    alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "Sorry you are not a winner this week");
}

I have a prob to solve, I have to use a loop to step through each position in an array of " winning numbers"to check whether the variable customer number (input from keyboard) matches any of the winning numbers. I must use a For loop to step through each position in the winning numbers array and to pare the customer number to each number the array contains. I cannot use any method to achieve this problem Thanks for your help! here what I did so far:

var customerNumbers = prompt("Enter your number:");
var winningNumbers = [12, 17, 24, 37, 38, 43];    

for (var i = 0; i < winningNumbers.length; i++) {

    if (customerNumbers == 12 || //condition determinates the winning numbers
        customerNumbers == 17 ||
        customerNumbers == 24 ||
        customerNumbers == 37 ||
        customerNumbers == 38 ||
        customerNumbers == 43)
        alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "We have a match and a winner!");
} else {
    alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "Sorry you are not a winner this week");
}

• javascript
• arrays
• loops

• So what is the problem? Above code not working? – Nikhil Aggarwal Commented Jun 15, 2015 at 16:15
• What do you know about for loops? What have you tried? What didn't work with the solution you tried? – Patrick Commented Jun 15, 2015 at 16:16
• What do you mean with "I cannot use any method to achieve this problem"? Is this some sort of homework, otherwise that is kind of a silly constraint? – Patrick Commented Jun 15, 2015 at 16:16

2 Answers 2

You should use indexOf() to check whether customerNumbers exists in winningNumbers

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

Script

var customerNumbers=prompt("Enter your number:" );
var winningNumbers=[12, 17, 24, 37, 38, 43];
if (winningNumbers.indexOf(parseInt(customerNumbers, 10)) > -1) 
    alert("This week Winning numbers are:"+"\n"+"\n"+winningNumbers+"\n"+"\n"+"The customer's Number is:"+"\n"+"\n"+customerNumbers+"\n"+"\n"+"We have a match and a winner!");
} else {
    alert("This week Winning numbers are:"+"\n"+"\n"+winningNumbers+"\n"+"\n"+"The customer's Number is:"+"\n"+"\n"+customerNumbers+"\n"+"\n"+"Sorry you are not a winner this week");
}

Below solution loops all the winning numbers and check for a match

var customerNumbers = prompt("Enter your number:");
var winningNumbers = [12, 17, 24, 37, 38, 43];
var match = false;

for (var i = 0; i < winningNumbers.length && !match ; i++) {
  if (winningNumbers[i] == customerNumbers) {
    match = true;
  }
}

if (match)
  alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "We have a match and a winner!");
} else {
  alert("This week Winning numbers are:" + "\n" + "\n" + winningNumbers + "\n" + "\n" + "The customer's Number is:" + "\n" + "\n" + customerNumbers + "\n" + "\n" + "Sorry you are not a winner this week");
}