डिक्शनरी के डिफ़ॉल्ट सबस्क्रिप्ट

let stock = ["pen": 5]
let pens: Int = stock["pen", default: 0]
print(pens + 1)

var counts: [String: Int] = [:]
let words = ["a", "b", "a", "a", "b"]
for word in words {
    counts[word, default: 0] += 1
}
print(counts["a", default: 0])
print(counts["b", default: 0])

var tally: [String: Int] = [:]
tally["x", default: 0] += 5
tally["x", default: 0] += 3
print(tally["x", default: 0])

let sales = [("apple", 3), ("pear", 2), ("apple", 4)]
var totals: [String: Int] = [:]
for (item, amount) in sales {
    totals[item, default: 0] += amount
}
print(totals["apple", default: 0])

let prices = ["tea": 3]
print(prices["tea"] ?? 0)
print(prices["tea", default: 0])

var groups: [String: [Int]] = [:]
groups["even", default: []].append(2)
groups["even", default: []].append(4)
print(groups["even", default: []])

var data: [String: Int] = [:]
_ = data["ghost", default: 0]
print(data.count)
data["real", default: 0] += 1
print(data.count)

var notes: [String: String] = [:]
notes["greeting", default: ""] += "Hello"
notes["greeting", default: ""] += " World"
print(notes["greeting", default: ""])

var freq: [Character: Int] = [:]
for ch in "banana" {
    freq[ch, default: 0] += 1
}
print(freq["a", default: 0])
print(freq["z", default: 0])

var c: [String: Int] = [:]
for x in ["a", "a", "b"] { c[x, default: 0] += 1 }
print(c["a", default: 0])