Question

In: Computer Science

Using JavaScript for the following assignment Design and code a function named "intersection" that takes two...

Using JavaScript for the following assignment

Design and code a function named "intersection" that

takes two arrays of numbers in parameter and returns a new

array containing only the values that are both in the

two arrays. A value must not be found more than once in

the resulting array but can be found more than once in

the arrays in parameter. The order of the elements in the resulting array

must respect the order of the first parameter. For example :

intersection ([3, 1, 4, 1, 5], [2, 4, 4, 3])

must return [3, 4].

You also need to design and code a unit test function and

call it. To test that the result of

intersection ([3, 1, 4, 1, 5], [2, 4, 4, 3])

which returns [3, 4], you can use a test like this:

assert (intersection ([3, 1, 4, 1, 5], [2, 4, 4, 3]) == "3,4");

This works because the == operator does the automatic conversion

from arrays to text (if one of the two operands are a text).

Expert Solution

Code:

<!DOCTYPE html>
<html>
<head>
<script>
function intersection(arr1,arr2) //function which is taking two arrays as input
{
var result=[]; //result array for storing resultant elements
           var k=0;
for (var i = 0; i < arr1.length; i++) //iterate loop from 0 to length of array1
{
for (var z = 0; z < arr2.length; z++) //iterate loop from 0 to length of array2
{
if ((arr1[i]==arr2[z])) //if elements are equal
{
                       if (result.includes(arr1[i])==true) // if the elements are already present in result break the loop
                           break;
                       else
                           {
                           result[k]=arr1[i]; //otherwise put element in result array
                           k=k+1; //increment k value
                           }
}
}
}
for (i=0;i<result.length;i++)
               document.writeln(result[i]); //print the result list in page
           return result; //return the result array
}
var arr1 = [3, 1, 4, 1, 5];
var arr2 = [2, 4, 4, 3]; //declaration of two arrays
var res=intersection (arr1,arr2); // calling intersection() function and storing returned result in res
       console.assert (res == "3,4",'Intersection Elements are wrong'); //finally writing assert() to check intersection elements is correct or not.
</script>
</head>
<body>

</body>
</html>

Code and Output Screenshots:

Note: assert gives error when expression is false so when the returned elements is 3,4 it will not print anything

in second code we are writing assert(res==3,1) it is false so it prints intersection elements are wrong.

Note: if you have any queries please post a comment thanks a lot..always available to help you...

venereology answered 7 months ago

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