3 // I'm a comment. #ComputerCantTouchThis
3 + 3 //addition
4 - 3 //subtraction
2 * 3.2 //multiplication
1 / 5 //division
10 % 3 //modulo
10 ** 3 //exponentiation
typeof 123
typeof 0.1
typeof "this is a string" // denoted by either "string value goes in here",
//'string value in here', or `string value in here`
typeof 'this is also a string'
typeof ""
typeof true // either true of false
typeof false
typeof undefined // the only possible value of an undefined type is undefined
// `typeof` doesn't work with `null` values for backwards compatability reasons.
typeof null
// when checking if something's explicitly `null`, make sure to use null === null
'bob' + 'mary'
'Luke, ' + 'I ' + 'am ' + 'your ' + 'father.'
true && true // the AND (&&) operator checks if both values are true
//if either one or both ANDed values are false,
true && false
//the operation returns false
true || true // the OR (||) operator checks if either value is true
//if one value is false, the result is still true
true || false
!true //The NOT (!) operator switches the boolean value
//Order of operations still applies in boolean algebra
!true && false || false || false
!(true && false) || false || false
{
var name = 'bob'
return name //this line is to make Observable happy
}
{
var num = 1
num = 2
return num
}
{
var one = 1
var two = 2
var three = one + two
return three
}
{
var firstName = 'Bob'
var lastName = 'Marley'
var fullName = firstName + ' ' + lastName
return fullName
}
{
var allMenAreMortal = true
var iAmAMan = true
return allMenAreMortal && iAmAMan
}
function converter (fahrenheit)
{
var Celsius = 0
Celsius = (fahrenheit-32)/(9/5)
return Celsius
}
function varWars1() {
var smartiesBot = true;
var sourBot = false;
var otherSourBot = sourBot;
return (smartiesBot || sourBot) || otherSourBot
}
function varWars2() {
var smartiesBot = true;
var sourBot = true;
var otherSourBot = false;
return (smartiesBot || sourBot || otherSourBot)
}
function varWarsArmageddon() {
var smartyKing = true;
var sourKidKing = false;
var smartiesBot = sourKidKing;// false
var thatOneSourBot = smartyKing;// true
return (smartiesBot || smartyKing) || (!sourKidKing && !sourKidKing) && thatOneSourBot && thatOneSourBot || (!smartiesBot && smartiesBot || !sourKidKing)
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
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