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function bcsub(left_operand, right_operand, scale) {
    // Returns the difference between two arbitrary precision numbers  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/bcsub    // +   original by: lmeyrick (https://sourceforge.net/projects/bcmath-js/)
    // -    depends on: _phpjs_shared_bc
    // *     example 1: bcsub(1, 2);
    // *     returns 1: -1
//  @todo: implement these testcases//        // set scale to zero
//        bcscale(0);
//
//        bcmath.test.result('bcsub', 1, '-1', bcsub('1','2'));
//        bcmath.test.result('bcsub', 2, '-6.0000', bcsub('-1','5', 4));//        bcmath.test.result('bcsub', 3, '8728932000054820705086578390258.00', bcsub('8728932001983192837219398127471','1928372132132819737213', 2));
//        bcmath.test.result('bcsub', 4, '-1.111000', bcsub('1.123', '2.234', 6));
//        bcmath.test.result('bcsub', 5, '-2.20', bcsub('1.123456', '3.333333', 2)); //-2.209877 note: rounding not applicable as bcmath truncates.
 
    var libbcmath = this._phpjs_shared_bc(); 
    var first, second, result;
 
    if (typeof(scale) == 'undefined') {
        scale = libbcmath.scale;    }
    scale   = ((scale < 0) ? 0 : scale);
 
    // create objects
    first   = libbcmath.bc_init_num();    second  = libbcmath.bc_init_num();
    result  = libbcmath.bc_init_num();
 
    first   = libbcmath.php_str2num(left_operand.toString());
    second  = libbcmath.php_str2num(right_operand.toString()); 
    result  = libbcmath.bc_sub(first, second, scale);
 
    if (result.n_scale > scale) {
        result.n_scale = scale;    }
 
    return result.toString();
}

1

bcsub(1, 2);

1

-1