var NumberArray = function (start, end, prefix, suffix){ 
var result = [] ; 
var i; 
var asString = false ; 
if (prefix || suffix) { 
asString = true ; 
if (!prefix) { 
prefix = ''; 
} 
if (!suffix) { 
suffix = ''; 
} 
} 
if (end < start) { 
for (i = start; i >= end; i-- ){ 
if (asString) { 
result.push(prefix + i.toString() + suffix); 
} 
 else { 
result.push(i); 
} 
} 
} 
 else { 
for (i = start; i <= end; i++ ){ 
if (asString) { 
result.push(prefix + i.toString() + suffix); 
} 
 else { 
result.push(i); 
} 
} 
} 
return result; 
} 
; 
module.exports = NumberArray;