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Swift Programming Language (Lesson 1-10)

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Swift Programming Language (Lesson 1-10)

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Escape sequence

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Escape sequence

"\"Hello, Jay\", said the teacher." or "Happy birthday, dear \(name)." = newline \t = tab

Arithmetic operator

+ for plus, - for minus, * for multiplication, / for division, and % for modulus.

not equal to? (comparison operator)

!= Eg: (a != b)

constant

An identifier that is immutable and can never be changed. Declared with let. Eg: let greeting = "hello"

assignment

used to give a name a value when you first declare a name or update a variable's value. Eg: let numOfSodas = 8

variable

an identifier that is mutable and can be updated by assigning a new value at any time. Declared with var

equal to? (comparison operator)

== let name = "world" if name == "world" { print("hello, world") }

Unicode standard

Defines a way to represent almost any character from any language in a consistent way.

function

Combines detailed steps into a single block of code that can be used again and again. Eg: print ( )

Compound Assignment Operatory

+=

Argument

Used to given an input value to a function.

or (logical operator)

|| Eg: let hasDoorKey = false let knowsOverridePassword = true if hasDoorKey || knowsOverridePassword { print("Welcome!") } else { print("ACCESS DENIED") }

log

A record of information about a program as it runs.

print

A function that tells a Swift program to log a message to the console.

comment

Notes left by the programmer to explain the code. Comment out by putting // in front of the code.

Error

A general term for a problem with the code.

assignment operator

=

Debugging

The process of identifying and fixing an error.

playground

An environment in Xcode where you can experiment with code and see instant results.

Parameter

To work with an input value inside a function.

String interpolation

Used when a value of a constant or variable is inserted in the middle of a string literal. Eg: let friendName = "lee" print ("Have a good one, \(friendName)")

and (logical operator)

&& Eg: let enteredDoorCode = true let passedRetinaScan = false if enteredDoorCode && passedRetinaScan { print("Welcome!") }

String

Text values are called strings, surrounded by quotation marks. Eg: "Hello, World!"

camel case

format used to create identifiers: first name is lowercase, no spaces, and next word is capitalized. Eg: firstName

escape character

(\) used in a string to tell Swift to treat what comes next as special. Called this because it escapes from the normal behavior of a string.

identifier

Refers to a value, type and is formal word for a name in code. Eg: var NumOfStudents = 4

keyword

Have special meanings in Swift and can't be used for other purposes. Eg: func, let, var,

"\"Hello, Jay\", said the teacher." or "Happy birthday, dear \(name)."
= newline \t = tab