Comparing Two Strings For Identical Values

// Write a program to check whether or not two arrays are identical in size, and hold identical values string1 = prompt('String 1?'); string2 = prompt('String 2?'); compareNum =

Solution 1:

Well you are comparing every letter in string1 with every letter in string2. If there are duplicate letters you'll get duplicate results.

Try this:

string1 = prompt("String 1?");
string2 = prompt("String 2?");
compareNum = 0; // why are you using the Number contructor? Unneeded.

l = Math.min(string1.length, string2.length);
for( i=0; i<l; i++) {
    if( string1.charAt(i) == string2.charAt(i)) compareNum++;
}

// do something with compareNum.

Solution 2:

You're looping over each character in string 1 and comparing it to each character in string 2--but you're looping over string 2 for every character in string 1.

The indices for each string should be the same; you don't need two loops.

How you handle strings whose lengths are different depends on your requirements.