Constants and Variables
Swift
// declare a constantlet maximumNumberOfLoginAttempts = 10
// declare a variablevar currentLoginAttempt = 0
// declare multiple constants or multiple variables on a single line, separated by commasvar x = 0.0, y = 0.0, z = 0.0
JavaScript
// declare a constantconst maximumNumberOfLoginAttempts = 10
// declare a variablevar currentLoginAttempt = 0// orlet currentLoginAttempt = 0
// declare multiple constants or multiple variables on a single line, separated by commasvar x = 0.0, y = 0.0, z = 0.0
Comments
Swift
// This is a comment.
/* This is also a commentbut is written over multiple lines. */
JavaScript
// This is a comment.
/* This is also a commentbut is written over multiple lines. */
Numeric Type Conversion
Swift
let pi = 3.14159// Integer and Floating-Point Conversionlet integerPi = Int(pi)
JavaScript
const pi = 3.14159// Integer and Floating-Point Conversionconst integerPi = parseInt(pi)
Booleans
Swift
let orangesAreOrange = truelet turnipsAreDelicious = false
if turnipsAreDelicious {print("Mmm, tasty turnips!")} else {print("Eww, turnips are horrible.")}
JavaScript
const orangesAreOrange = trueconst turnipsAreDelicious = false
if (turnipsAreDelicious) {console.log("Mmm, tasty turnips!")} else {console.log("Eww, turnips are horrible.")}
Error Handling
Swift
func canThrowAnError() throws {// this function may or may not throw an error}do {try canThrowAnError()// no error was thrown} catch {// an error was thrown}
JavaScript
function canThrowAnError() {// this function may or may not throw an error}try {canThrowAnError()// no error was thrown} catch (e) {// an error was thrown}