function mapToStr( src, keyValDelimeter, entryDelimeter )
{
let result = '';
for( let s in src )
result += s + keyValDelimeter + src[ s ] + entryDelimeter;
result = result.substr( 0, result.length-entryDelimeter.length );
return result
}
console.log( mapToStr( { a : 1, b : 2, c : 3 }, ':', ';' ) );
// log : a:1;b:2;c:3