const contracts = {
    'EOS':'0x86fa049857e0209aa7d9e616f7eb3b3b78ecfdb0',
    'FBC':'0x0c6df9bb12b32aeec1e117936457ed83ad8a1c70',
    'USDT':''
};

for(let symbol in contracts) {  
    console.log(symbol,contracts[symbol]);  
} 			
			
			

			
arr.forEach(function (item) {
  someFn(item);
})

elements.forEach(function(element){
  
});
			
			

			
var a = ["a", "b", "c"];
a.forEach(function(entry) {
    console.log(entry);
});