Question

In the following code correctSNILS is finally true in Firefox (which is correct) and false in IE7. How to identify why?

var value = "02324423703";
var correctSNILS = false;
if (value.length == 11) {
    var controlDigits = value.slice(9);
    var SNILS = value.slice(0, 9);
    if (SNILS < 1001998) {
        correctSNILS = true;
    } else {
        var total = SNILS.length;
        var result = 0;
        for (var i = 0; i < total; i++) {
            result += (total - i) * SNILS[i];
        }
        if (result == 100 || result == 101) result = "00";
        if (result > 101) result %= 101;
        if (result == controlDigits) correctSNILS = true;
    }
}
$("#result").text(correctSNILS);

demo

Answer 1

You can’t access String as an array in IE7:

result += (total - i) * SNILS[i];

change that to use charAt string function:

result += (total - i) * SNILS.charAt(i);