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Hard Coded Quiz

After the following code, what is the message displayed to the user?

let firstName = null;

let lastName = null;

let nickName = "Supercoder";

alert(firstName ?? lastName ?? nickName ?? "Anonymous");

A) Anonymous
B) firstname
C) Supercoder
D) null Check Q1
After the following code, what will be the value of 'tallEnough'?

let height = 0;

tallEnough = (height || 100);

A) 0
B) 100
C) null
D) TRUE Check Q2
After the following code, what will be the value of 'words'?

var words = (a() && b())

function a(){return "hello";}

function b(){return "world";}

A) helloworld
B) TRUE
C) hello
D) world Check Q3
What is the correct way to rewrite the following function using arrow functions?

let sum = function(a, b) {

return a + b;

};

A) let sum = (a, b) => a + b;
B) let sum(a, b) -> a + b;
C) sum = function(var a, var b) {return a && b;}
D) function(a, b) => a + b; Check Q4
After the following code, what will be the value of 'd'?

let logicAnd = (a, b) => a && b;

let logicValid = (a, b) => a ?? b;

let logicOr = (a, b) => a || b;

function maths(a, b, c) {

return (logicOR(a, b) + logicAnd(a, b) + logicValid(c, b));

}

let a = 1;

let b = 2;

let c = 0;

let d = maths(a, b, c);

A) TRUE
B) 3
C) FALSE
D) 5 Check Q5
Which of the following is NOT valid?
A) let product = (a, b) => a * b;
B) let logicValidOr = (a, b, c) => (a ?? b) || c;
C) let logicAndOr = (a, b, c) => a && b || c;
D) let logicValidAnd = (a, b, c) => a ?? b && c; Check Q6

Andrew Ledger

Software Programmer

Hard Coded Quiz