Boolean Logic Exercises

Part_I

1.2 == "2";

True

2.2 === 2;

True

3.10 % 3;

1

4.10 % 3 === 1;

True

5.true && false;

False

6.false || true;

True

7.true || false;

True

Part_II

(a)

let isLearning = true; if(isLearning){ console.log("Keep it up!"); } else { console.log("Pretty sure you are learning...."); }

1.What should the above code console.log?

It will console.log "Keep it up" because the value of isLearning is truthy.

2.Why do we not need to specify if(isLearning === true)? Why does if(isLearning) work on its own?

Because true is a truthy value

(b)

let firstvariable; let secondvariable = ""; let thirdvariable = 1; let secretMessage = "Shh!";

if(firstvariable){ console.log("first"); } else if(firstvariable || secondvariable){ console.log("second"); } else if(firstvariable || thirdvariable){ console.log("third"); } else { console.log("fourth"); }

1.What should the above code console.log? Why?

It will console.log "third" since the third variable is true and the first variable and the second variable are false.this is because the || (or) operator returns true if either condition is true.

2.What is the value of firstvariable when it is initialized?

It is undefined because it is not assigned to any value.

3.Is the value of firstvariable a “truthy” value? Why?

The value of first variable is a falsey value because undefined is a falsey value.

4.Is the value of secondvariable a “truthy” value? Why?

It is a not a truthy value since it is an empty string and empty strings are said to be falsey values.

5.Is the value of thirdvariable a “truthy” value? Why?

The third variable is a truthy value since it is a number.All numbers are said to be truthy except for 0 which is a falsey value.

Part_III

1.Research Math.random here and write an if statement that console.log’s “Over 0.5” if Math.random returns a number greater than 0.5. Otherwise console.log “Under 0.5”.

Answered in index.js file

2.What is a falsey value? List all the falsey values in JavaScript.

They are values that are actually false when they are used in javaScript. Examples of falsey values are;undefined,null,Nan,0,false and an empty string ("").