The avatar for @mmakutonin
mmakutonin
Published
IT-280B FA'19
Edited
Jun 15, 2019
Fork of Jan 28th: Variables, Strings, Math, Comparisons
•
13 forks
IT-280B FA'19
August 26: Variables, Strings, and Math
Aug 28th: Advanced Comparisons, Variables, Booleans, and Type Coersion
Aug 30th: if, for, while, and some functionsSep 2nd: Objects and More Functions!Sep 4: Arrays and HTML ProjectSep 9: Advanced Functions I: Closures, IIFEs, Factory Functions, and ModulesSeptember 11: Advanced Functions II: Promises, Async/Await, and APIsSeptember 13: Advanced Primitives I: String Templates and PaddingSeptember 16: Advanced Primitives II: Destructuring and ...restSeptember 18: Code Review: Primitives, Functions, and ObjectsSeptember 20: Advanced Functions III: Higher Order Functions (HOFs)September 23: Advanced Objects I: PrototypesSeptember 25: Advanced Functions IV: Advanced this(Bind, Call, Apply), and Function===ObjectSeptember 27th: Advanced Objects II: ClassesSeptember 30: Advanced Objects III: Class InheritanceOctober 2: Advanced Functions 5: Arrow Functions and Default Function Parameters, and functional ...restOctober 4: let and constOctober 9: Review and Export/ImportOctober 11th: Intro to ReactOctober 14th: React Day 2October 16th: React Day 3
Insert cell
Insert cell
Insert cell
//test your answer here
Insert cell
Insert cell
Insert cell
3 == 3 // 3 is equal to 3
Insert cell
3 === 3 // 3 is equal to 3
Insert cell
3 == 2 // 3 isn't equal to 2 so this outputs or "returns" false
Insert cell
3 === 2 // 3 isn't equal to 2 so this outputs or "returns" false
Insert cell
3 != 2 // 3 isn't equal to 2
Insert cell
3 != 3 // 3 is equal to 3 so this outputs or "returns" false
Insert cell
3 !== 2 // 3 isn't equal to 2
Insert cell
3 !== 3 // 3 is equal to 3 so this outputs or "returns" false
Insert cell
Insert cell
true && true // the and operator outputs or "returns" true if both booleans given are true
Insert cell
true && false
Insert cell
false && false
Insert cell
true || false // the "or" operator returns true if at least one of the booleans given is true
Insert cell
true || true
Insert cell
false || false
Insert cell
!false // the negation operator "!" will flip the boolean value that comes after it.
// the opposite of false is true
Insert cell
!true // the opposite of true is false
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
num1 + num2
Insert cell
{
var allMenAreMortal = true
var iAmAMan = true
return allMenAreMortal && iAmAMan
}
Insert cell
Insert cell
Insert cell
firstName + " " + lastName
Insert cell
Insert cell
Insert cell
Insert cell
true + true
Insert cell
+null == 0
Insert cell
"3" + 1
Insert cell
"3" - - 1
Insert cell
1 + + "3"
Insert cell
false == ""
Insert cell
!""
Insert cell
Insert cell
Insert cell
Insert cell
!!0 // 0 is falsy
Insert cell
!!null // null is falsy
Insert cell
!!undefined // undefined is falsey
Insert cell
!!"" // an empty string is falsy
Insert cell
!!123 // numbers other than 0 are truthy
Insert cell
!!"this is a string" // non-empty strings are truthy
Insert cell
Insert cell
Insert cell
"" == false
Insert cell
0 == false
Insert cell
"foobar" == true
Insert cell
"1" == 1
Insert cell
0 == "0"
Insert cell
undefined == null
Insert cell
Insert cell
"" === false
Insert cell
0 === false
Insert cell
"foobar" === true
Insert cell
"1" === 1
Insert cell
0 === "0"
Insert cell
undefined === null
Insert cell
Insert cell
Insert cell
function example()
{
// Like so:
return "this is my answer"
// This allows the value to be printed in this notebook.
// This isn't a JavaScript feature but rather a quirk of this website.
}
Insert cell
Insert cell
Insert cell
function truthyIzer(bob)
{
//Write your code here
}
Insert cell
bob=0 //Test your code here
Insert cell
Insert cell
{
if(truthyIzer(0)===undefined)
return "Your function will be unit tested here"
try
{
expect(truthyIzer(1)).to.equal(true)
expect(truthyIzer("false")).to.equal(true)
expect(truthyIzer("")).to.equal(false)
expect(truthyIzer(-1)).to.equal(true)
expect(truthyIzer(0)).to.equal(false)
expect(truthyIzer({})).to.equal(true)
return success()
}
catch(err)
{
return failure()
}
}
Insert cell
Insert cell
function converter (fahrenheit)
{
return 'This is the temperature in Fahrenheit: ' + fahrenheit; //This currently returns the temperature in fahrenheit. Modify the code to return the temperature in Celcius.
}
Insert cell
fahrenheit = -328 //Check your code here
Insert cell
Insert cell
{
if(converter(12)==='This is the temperature in Fahrenheit: 12')
return "Your function will be unit tested here"
try
{
expect(converter(32)).to.equal(0)
expect(converter(122)).to.equal(50)
expect(converter(-67)).to.equal(-55)
expect(converter(-328)).to.equal(-200)
return success()
}
catch(err)
{
return failure()
}
}
Insert cell
Insert cell
function candyGeddon (smartiesVar,sourKidsVar)
{
//You can modify code starting here
var bob = smartiesVar;
var joe = sourKidsVar;
var sammy = smartiesVar = "bob";
var muyDios = 3+952-13+687;
var ohNo = joe !=== sammy;
var goodness = 900000%9+5;
var math = goodness => muyDios
var vars = sammy || ohNo
//don't modify below this line
return math && vars
}
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell

Purpose-built for displays of data

Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
Learn more