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Interview Questions – ES6 Questions


  1. What is traceur?
    • ES6 -> ES5
    • Traceur is a JavaScript.next-to-JavaScript-of-today compiler that allows you to use features from the future today. Traceur supports ES6 as well as some experimental ES.next features.Traceur’s goal is to inform the design of new JavaScript features which are only valuable if they allow you to write better code. Traceur allows you to try out new and proposed language features today, helping you say what you mean in your code while informing the standards process.JavaScript’s evolution needs your input. Try out the new language features. Tell us how they work for you and what’s still causing you to use more boilerplate and “design patterns” than you prefer

     

  2. What are the required node_modules to makes traceur working properly
    • $ npm install traceur
      $ npm install traceur-runtime
  3. Why do you need traceur-runtime?
  4. What is the node command to compile ES6 to ES5?

Java examples: Enhanced For Loop


public static void enhancedForLoop(){
int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9};
System.out.println("\nEXAMPLE: Enhanced For Statement");
for (int temp: arr){ // Create a temporary variable, same type as array values. For
// loop assign array value to the temporary variable
System.out.println("Enhanced = " + temp);
}
}

Java examples: Switch Statement


public static void witchStatment(int num) {
System.out.println("\nEXAMPLE: Switch Statement");
switch(num){ //Check the value
case 0:
System.out.println("Case = " + num); // Execute this if 'case' matches the 'value'
break; // Stop the statement
case 1:
System.out.println("Case = " + num); // Execute this if 'case' matches the 'value'
break; // Stop the statement
case 2:
System.out.println("Case = " + num); // Execute this if 'case' matches the 'value'
break; // Stop the statement
case 3:
System.out.println("Case = " + num); // Execute this if 'case' matches the 'value'
break; // Stop the statement
case 4:
System.out.println("Case = " + num); // Execute this if 'case' matches the 'value'
break; // Stop the statement
default:
System.out.println("Default = " + num);
}
}

Java examples: While Loop vs ‘do’-while loop


While Loop

public static void whileLoop(){
System.out.println("\nEXAMPLE: While Loop");
int num = 0;
while(num <= 20) { // Check the while condition first, Then execute the loop
// Then while 'l' is less than or equal to '0'
System.out.println("num = " + num);
num++; //increment 'l' by 1
}
}

‘do’-while loop

public static void doWhileLoop() {
System.out.println("\nEXAMPLE: Do While Loop");
int num = 0;
do {
// DO the work... Execute the loop first
System.out.println("num = " + num);
num++; //increment 'l' by 1
} while(num <= 20); // Check the conditions
}