JavaScript Basics - Foundations data types and conditionals

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Foundations data types and conditionals

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Minh Nhat Pham

Vietnam

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JavaScript Basics - Foundations data types and conditionals


JavaScript Basics - Foundations data types and conditionalsVersión en línea Foundations data types and conditionals por Minh Nhat Pham 1 Which of these is a string? a Hello b 42 c TRUE d null 2 Which data type is used for whole numbers? a String b Number c Boolean d Array 3 typeof "dog" returns: a number b string c boolean d object 4 typeof false returns: a boolean b string c FALSE d undefined 5 Which of these is NOT a JavaScript data type? a Number b Boolean c Character d String 6 typeof null gives: a null b object c undefined d boolean 7 What does typeof undefined return? a null b undefined c object d string 8 What is the result of "5" + 3? a 8 b 53 c 8 (string) d Error 9 What is the result of 5 + "3"? a 8 b 53 c 8 (string) d Error 10 What is the result of 10 / "2"? a 5 (string) b 5 c Error d NaN 11 What keyword starts a conditional statement? a when b if c check d for 12 What keyword provides an alternative branch? a other b else c elseif d case 13 if (5 > 3) { console.log("yes"); } prints: a nothing b yes c FALSE d Error 14 if (2 > 5) { console.log("hi"); } else { console.log("bye"); } prints: a hi b bye c nothing d Error 15 Which is the correct syntax? a if x > 5 then {} b if (x > 5) {} c if {x > 5} d if (x > 5) then {} 16 true && false evaluates to: a TRUE b FALSE c N/A d N/A 17 true \|\| false evaluates to: a TRUE b FALSE c N/A d Undefined 18 !true evaluates to: a TRUE b FALSE c N/A d undefined 19 !false evaluates to: a TRUE b FALSE c N/A d undefined 20 If x = 10, what does x > 5 return? a TRUE b FALSE c N/A d N/A 21 2 + 3 * 2 equals: a 10 b 8 c 12 d 7 22 10 % 3 equals: a 0 b 1 c 3 d 10 23 What does === check? a only value b only type c both value and type d nothing 24 5 == "5" is: a TRUE b FALSE c N/A d Error 25 5 === "5" is: a TRUE b FALSE c N/A d Error 26 Which operator means 'not equal'? a != b == c <> d = 27 if ("apple" === "apple") is: a TRUE b FALSE c N/A d Error 28 Which of these will make the condition true if x = 3? a x > 5 b x < 5 c x === 10 d x !== 3 29 What will if (0) do? a Run the block b Skip the block c N/A d Error 30 What will if ("") do? a Run the block b Skip the block c N/A d Error

JavaScript Basics - Foundations data types and conditionals

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JavaScript Basics - Foundations data types and conditionalsVersión en línea

por Minh Nhat Pham

Which of these is a string?

Which data type is used for whole numbers?

typeof "dog" returns:

typeof false returns:

Which of these is NOT a JavaScript data type?

typeof null gives:

What does typeof undefined return?

What is the result of "5" + 3?

What is the result of 5 + "3"?

What is the result of 10 / "2"?

What keyword starts a conditional statement?

What keyword provides an alternative branch?

if (5 > 3) { console.log("yes"); } prints:

if (2 > 5) { console.log("hi"); } else { console.log("bye"); } prints:

Which is the correct syntax?

true && false evaluates to:

true || false evaluates to:

!true evaluates to:

!false evaluates to:

If x = 10, what does x > 5 return?

2 + 3 * 2 equals:

10 % 3 equals:

What does === check?

5 == "5" is:

5 === "5" is:

Which operator means 'not equal'?

if ("apple" === "apple") is:

Which of these will make the condition true if x = 3?

What will if (0) do?

What will if ("") do?