var menu:[String] = [“1”,“2”,“3”]

print(menu.count)

print(menu[0])

menu+=[“4”,“5”]

menu+=[“6”,“7”]

print(menu.count)

print(menu[1…3])

let constantName=1

print(constantName)

let decimalInteger=17

let binaryInteger=0b10001

let octalInteger=0o21

let hexadecimalInteger=0x11

print(decimalInteger)

print(binaryInteger)

print(octalInteger)

print(hexadecimalInteger)

var company: = [
“APPL”: “Apple Inc”,
“GOOG” : “Google Inc”,
“AMZN” : “Amazon.com Inc”,
“FB” : “Facebook Inc”
]

print(company[“APPL”]!)//if this value may become empty, and the ! may help solve the optional one back to the ordinary variable

總結

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