Values, Types & Operators Exercises

Problem One

What are the types of the following expressions and what do they evaluate to, and why?

• 17 // number because its not a letter
• 1 + 2 * 3 + 4 11 because of pemdas
• 800 / 80 / 8 1.25
• 400 > 200 Boolean becauee True
• 1 !== 1 false
• true || false True, because true is present it is true
• true && false False because a true can not be false
• 20 % 6 It a number, the answer is 2 because that is the remainder
• 'a' + 'b' ab , its a string, it will place together because of the add sign

Problem Two

What will the following return?

• typeof 4 number
• typeof 'hello' string
• typeof true string
• 2 === 1 || 3 === 4 false

Problem Three

Create a truth table for the expression A || B

| A | B | A || B | |-------|-------|--------| | true | true | true | | false | true | true | | true | false | true | | false | false | false |

Problem Four

Create a truth table for the expression !A && !B

A	B	!B	A && B
true	true	false	false
false	true	false	false
true	false	true	true
false	false	true	false

Problem Five

Create a truth table for the expression !(A || B)

| !A | !B | A || B | !A || B| |-------|-------|---------|--------| | true | true | true | false | | false | true | true | false | | true | false | true | false | | false | false | false | true |

Problem Six

Write a step-by-step evaluation for the following expression (remember order of operations): 2 + 3 * 2 + 1. 2 + 3 * 2 + 1 ->2 + 6 + 1 -> 8 + 1 ->9

Problem Seven

Write a step-by-step evaluation for the following expression (remember order of operations): 4 / 2 + 8 / 4. 4 / 2 + 8 / 4 -> 2 + 8 / 4 -> 2 + 2 -> 4

Problem Eight

Write a step-by-step evaluation for the following expression: 'ca' + 'ter' + 'pi' + 'llar'. 'ca' + 'ter' + 'pi' + 'llar' -> cater + 'pi' + 'llar' --> caterpi + 'llar' ---> caterpillar

Problem Nine

Write a step-by-step evaluation for the following expression: 2 * 4 === 8 && 'car' + 'pool' === 'carpool'. 2 * 4 === 8 && 'car' + 'pool' === 'carpool' -> 8 === 8 && 'car' + 'pool' === 'carpool' --> true && 'car'+ 'pool' === 'carpool' ---> true && 'carpool' === "carpool' ----> true && true -----> true

Problem Ten

Write a step-by-step evaluation for the following expression: '1' + '2' + '3' - '1'. '1' + '2' + '3' - '1' -> 12 + '3' - '1' --> 123 - '1' ---> 122