JavaScript equivalent to C strncmp (compare string for length)

Question

Is there an equivalent in JavaScript to the C function strncmp? strncmp takes two string arguments and an integer length argument. It would compare the two strings for up to length chars and determine if they were equal as far as length went.

Does JavaScript have an equivalent built in function?

Answer 1

You could easily build that function:

function strncmp(str1, str2, n) {
  str1 = str1.substring(0, n);
  str2 = str2.substring(0, n);
  return ( ( str1 == str2 ) ? 0 :
                              (( str1 > str2 ) ? 1 : -1 ));
}

An alternative to the ternary at the end of the function could be the localeCompare method e.g return str1.localeCompare(str2);

Answer 2

It does not. You could define one as:

function strncmp(a, b, n){
    return a.substring(0, n) == b.substring(0, n);
}