Assignment Operator Swift let b = 10var a = 5a = b // decomposed tuple with multiple values into multiple variableslet (x, y) = (1, 2)print("x = \(x), y = \(y)") // x = 1, y = 2 JavaScript let b = 10var a = 5a = b // object matching with destructuring assignmentconst {x, y} = {x:1, y:2}console.log(`x = ${x}, y = ${y}`) // x = 1, y = 2// or array matching with destructuring assignmentconst [x, y] = [1, 2]console.log(`x = ${x}, y = ${y}`) // x = 1, y = 2 Arithmetic Operators Addition (+) Subtraction (-) Multiplication (*) Division (/) Swift 1 + 2 // equals 35 - 3 // equals 22 * 3 // equals 610.0 / 2.5 // equals 4.0"hello, " + "world" // equals "hello, world" JavaScript 1 + 2 // equals 35 - 3 // equals 22 * 3 // equals 610.0 / 2.5 // equals 4"hello, " + "world" // equals "hello, world" Remainder Operator Swift 9 % 4 // equals 1-9 % 4 // equals -1 JavaScript 9 % 4 // equals 1-9 % 4 // equals -1 Unary Minus/Plus Operator Swift let three = 3let minusThree = -three // minusThree equals -3let plusThree = -minusThree // plusThree equals 3, or "minus minus three" let minusSix = -6let alsoMinusSix = +minusSix // alsoMinusSix equals -6 JavaScript const three = 3const minusThree = -three // minusThree equals -3const plusThree = -minusThree // plusThree equals 3, or "minus minus three" const minusSix = -6const alsoMinusSix = +minusSix // alsoMinusSix equals -6 Compound Assignment Operators Swift var a = 1a += 2 // a is now equal to 3 JavaScript let a = 1a += 2 // a is now equal to 3 Comparison Operators Equal to (a == b) Not equal to (a != b) Greater than (a > b) Less than (a < b) Greater than or equal to (a >= b) Less than or equal to (a <= b) Identity operators, refer to the same object instance (a === b) Identity operators, not refer to the same object instance (a !== b) Swift 1 == 1 // true because 1 is equal to 12 != 1 // true because 2 is not equal to 12 > 1 // true because 2 is greater than 11 < 2 // true because 1 is less than 21 >= 1 // true because 1 is greater than or equal to 12 <= 1 // false because 2 is not less than or equal to 1 let name = "world"if name == "world" {print("hello, world")} else {print("I'm sorry \(name), but I don't recognize you")}// Prints "hello, world", because name is indeed equal to "world". let p1 = Person();let p2 = Person();p1 === p2 // falsep1 !== p2 // true JavaScript 1 == 1 // true because 1 is equal to 12 != 1 // true because 2 is not equal to 12 > 1 // true because 2 is greater than 11 < 2 // true because 1 is less than 21 >= 1 // true because 1 is greater than or equal to 12 <= 1 // false because 2 is not less than or equal to 1 const name = "world"if (name == "world") {console.log("hello, world")} else {console.log(`I'm sorry ${name}, but I don't recognize you`)}// Prints "hello, world", because name is indeed equal to "world". const p1 = new Person();const p2 = new Person();p1 === p2 // falsep1 !== p2 // true Ternary Conditional Operator Swift let contentHeight = 40let hasHeader = truelet rowHeight = contentHeight + (hasHeader ? 50 : 20)// rowHeight is equal to 90 JavaScript const contentHeight = 40const hasHeader = trueconst rowHeight = contentHeight + (hasHeader ? 50 : 20)// rowHeight is equal to 90 Logical Operators Logical NOT (!a) Logical AND (a && b) Logical OR (a || b) Swift let allowedEntry = falseif !allowedEntry {print("ACCESS DENIED")}// Prints "ACCESS DENIED" let hasDoorKey = falselet knowsOverridePassword = trueif enteredDoorCode && passedRetinaScan || hasDoorKey || knowsOverridePassword {print("Welcome!")} else {print("ACCESS DENIED")}// Prints "Welcome!" JavaScript const allowedEntry = falseif (!allowedEntry) {console.log("ACCESS DENIED")}// Prints "ACCESS DENIED" const hasDoorKey = falseconst knowsOverridePassword = trueif (enteredDoorCode && passedRetinaScan || hasDoorKey || knowsOverridePassword) {console.log("Welcome!")} else {console.log("ACCESS DENIED")}// Prints "Welcome!" More of Swift and JavaScript comparison snippets
