Sözlükler

Orta Düzey Julia

Anthony Markham

Quantitative Developer

Sözlükler - giriş

stock = ["AAPL", 131.86, 100000]
println(stock[1])

AAPL

# Dictionary definition
stock = Dict("ticker" => "AAPL", "price" => 131.86)
println(stock["ticker"])

AAPL

stock = Dict("ticker" => "AAPL", "price" => 131.86)

Dict{String, Any} ile 2 girdi:
  "ticker" => "AAPL"
  "price"  => 131.86

Türlü sözlükler, anahtarın veya değerin belirli bir veri türünde olmasını zorlar.

stock_typed = Dict{String, Integer}("ticker" => "AAPL", "price" => 131.86)

MethodError: Cannot `convert` an object of type String to an object of type Integer

stock_typed = Dict{String, Any}("ticker" => "AAPL", "age" => 131.86)

Dict{String, Any} ile 2 girdi:
  "ticker" => "AAPL"
  "age"    => 131.86

stock = Dict("ticker" => "AAPL", "price" => 131.86)
for i in stock
    println(i)
end

Pair{String, Any}("ticker", "AAPL")
Pair{String, Any}("price", 131.86)

for i in keys(stock)
    println(i)
end

ticker
price

for (ticker, price) in stock
    println(ticker, " ", price)
end

ticker AAPL
price 131.86

get(dictionary_name, dictionary_key, default_value)

stock = Dict("ticker" => "AAPL", "price" => 131.86)
println(get(stock, "ticker", "Key not found."))

AAPL

Yeni anahtar ekleyebilir, mevcut değerleri değiştirebilir ve anahtar silebiliriz.

# Add a new key
stock["volume"] = 62128300
println(stock)

Dict{String, Any}("ticker" => "AAPL", "price" => 131.86, "volume" => 62128300)

# Modify an existing value
stock["price"] = 125.27
println(stock)

Dict{String, Any}("ticker" => "AAPL", "price" => 125.27, "volume" => 62128300)

Orta Düzey Julia