js interview questions

counter.js

var counter = require('counter.js');
counter.increment();
console.log(counter.value); //prints 1

var counter2 = require('counter.js');
counter2.increment();
console.log(counter2.value); //prints 2

creation.js

var alex = new Student('Alex');
alex.haveFun(); //should output 'Alex is having fun'

hasDups.js

function hasDups(arr){
  <....>
}
  
a1 = [[1, 2, 3], [4, 5, 6], [7, 1, 8]];
a2 = [[1,2,3],[4,5,6,7], [8,9,10,11,12], [13,14,15]]
hasDups(a1); //true
hasDups(a2); //false
  

loadData.js

try {
  loadData('/api/entities', function (err, data){
    if (!err){
      console.log('Error fetching data: ' + err);
    }
    JSON.parse(data);
  });
} catch (ex){
  console.log('Error parsing data: ' + ex);
}

options.js

var defaultOptions = {a: 10; b:20};
var options = {a: 15};

var full = withDefault(options, defaultOptions);

console.log(full.a); //15
console.log(full.b) //20
console.log(options.b) // undefined