Predict the output of the following JavaScript code.

var a = "javascript"; 
var result = a.substring(2, 3); 
document.write(result);

What will be the output of the following code snippet?

console.log(parseInt("123Hello"));
console.log(parseInt("Hello123"));

What output will come if we run the following part of the JavaScript code?

const string2Num = parseInt("123abc");
console.log(string2Num);