TUPLES : là một tập hợp bất biến của các giá trị riêng biệt của các kiểu dữ liệu giống nhau hoặc khác nhau được phân tách bằng dấu phẩy.

Cú pháp: (item1, item2, item3…)

Từ điển: là một tập hợp các cặp khóa-giá trị, trong đó mỗi giá trị trong từ điển có thể được truy cập bằng khóa của nó. Các cặp khóa-giá trị này không cần cùng kiểu dữ liệu.

Cú pháp: Dict (key1 => value1, key2 => value2,…)

Tuples và phương thức ()

#create an empty tuple
t1=()
println(“If a Tuple is empty returns “, isempty(t1))
t1=(“julia”,”python”,”sql”)
println(“If a Tuple is non-empty returns “,isempty(t1))
Output:
If a Tuple is empty returns true
If a Tuple is non-empty returns false

#declare a tuple beverage
beverage= (“coffee”,”tea”,”greentea”,”grrencoffee”,”ginger tea”)
#Indexing
println(beverage[1])
Output: coffee
println(beverage[0]) #index in julia starts from 1
BoundsError: attempt to access NTuple{5, String} at index [0]

Stacktrace:
 [1] getindex(t::Tuple, i::Int64)
   @ Base .\tuple.jl:29
 [2] top-level scope
   @ In[7]:2
 [3] eval
   @ .\boot.jl:373 [inlined]
 [4] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
   @ Base .\loading.jl:1196
#Slicing
println(beverage[2:4])
Output:
("tea", "greentea", "grrencoffee")
#Iteration
println("iterating over tuple :")
for i in beverage
    println(i)
end
Output:
iterating over tuple :
coffee
tea
greentea
grrencoffee
ginger tea
#Tuple manipulation:
beverage[3]="chamomile tea"
Output:
MethodError: no method matching setindex!(::NTuple{4, String}, ::String, ::Int64)

Stacktrace:
 [1] top-level scope
   @ In[7]:2
 [2] eval
   @ .\boot.jl:373 [inlined]
 [3] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
   @ Base .\loading.jl:1196

Phương thức Tuple ()

#reverse a tuple
rev= reverse(beverage)
println(rev)
Output:("ginger tea", "grrencoffee", "greentea", "tea", "coffee")
#length of tuple
println(“length of tuple “,length(beverage))
Output: length of tuple 5
#check if empty or not
println(isempty(beverage))
Output: false

lang= (l1=”julia”,l2=”python”,l3=”SQL”)
println(lang)
Output: (l1 = "julia", l2 = "python", l3 = "SQL")
println(lang[2])
Output: python
println(lang.l1)
Output: julia

#create a dictionary
empIDs= Dict(“vivek”=>121,”aniket”=>134,”jagdish”=>101)
println(typeof(empIDs))
println(empIDs)
Output:
Dict{String, Int64}
Dict("jagdish" => 101, "vivek" => 121, "aniket" => 134)
#create dict from tuple
eds=[("vivek",2000),("jagdish",5000),("aniket",3500)]
println(typeof(eds))
println(eds)
Output:
Vector{Tuple{String, Int64}}
[("vivek", 2000), ("jagdish", 5000), ("aniket", 3500)]
#conver the tuple into dictionary
edict=Dict(eds)
println(typeof(edict))
println(edict)
Output:
Dict{String, Int64}
Dict("jagdish" => 5000, "vivek" => 2000, "aniket" => 3500)

println(edict)
Output:
Dict("jagdish" => 5000, "vivek" => 2000, "aniket" => 3500)
key=keys(edict)
println(“keys are :”,key)
Output: keys are :["jagdish", "vivek", "aniket"]
val=values(edict)
println(“values are :”, val)
Output: values are :[5000, 2000, 3500]
#Iterate over dictionary using for loop 
for (key,val) in edict
    println(key,"=>",val)
end
Output:
jagdish=>5000
vivek=>2000
aniket=>3500

get () và getkey ()

#get() method: Return the value stored for the given key
#syntax: get(collection, key, default)
println(edict)
Output:
Dict("jagdish" => 5000, "vivek" => 2000, "aniket" => 3500)
println(get(edict,"vivek",-1))
Output: 2000
#default value is mandatory otherwise it throws error
println("Key not found ",get(edict,"viv",0))
Output: Key not found 0
#wihtout default value
println("Key not found ",get(edict,"viv"))
Output:
MethodError: no method matching get(::Dict{String, Int64}, ::String)
Closest candidates are:
  get(::Dict{K, V}, ::Any, ::Any) where {K, V} at C:\Users\lenovo\AppData\Local\Programs\Julia-1.7.1\share\julia\base\dict.jl:506
  get(::IJulia.IJuliaStdio, ::Any, ::Any) at C:\Users\lenovo\.julia\packages\IJulia\e8kqU\src\stdio.jl:21
  get(::Test.GenericDict, ::Any, ::Any) at C:\Users\lenovo\AppData\Local\Programs\Julia-1.7.1\share\julia\stdlib\v1.7\Test\src\Test.jl:1800
  ...

Stacktrace:
 [1] top-level scope
   @ In[57]:7
 [2] eval
   @ .\boot.jl:373 [inlined]
 [3] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
   @ Base .\loading.jl:1196
#getkey()
Return the key matching argument key if one exists in collection, otherwise return default.
println(getkey(edict,"aniket",-1))
Output: aniket
println(getkey(edict,"viv",-1))
Output: -1

println(edict)
Output:
Dict("jagdish" => 5000, "vivek" => 2000, "aniket" => 3500)
delete!(edict,”vivek”)
println(edict)
Output:
Dict("jagdish" => 5000, "aniket" => 3500)
#delete a non-existing item
delete!(edict,"viv")
Output: 
Dict{String, Int64} with 2 entries:
  "jagdish" => 5000
  "aniket"  => 3500

#merge dictionaries using merge()
d1 = Dict(“a”=>1, “b”=>9, “c”=>3)
d2 = Dict(“e”=>7, “f”=>2, “h”=>5)
println(merge(d1,d2))
Output:
Dict("f" => 2, "c" => 3, "e" => 7, "b" => 9, "a" => 1, "h" => 5)
#common keys present
d1 = Dict("a"=>1, "b"=>9, "c"=>3)
d2 = Dict("e"=>7, "b"=>2, "h"=>5)
println(merge(d1,d2))
Output:
Dict("c" => 3, "e" => 7, "b" => 2, "a" => 1, "h" => 5)
#merge dictionaries using mergewith()
d1 = Dict("a"=>1, "b"=>9, "c"=>3)
d2 = Dict("e"=>7, "b"=>2, "h"=>5)
println(mergewith!(+,d1,d2))
Output:
Dict("c" => 3, "e" => 7, "b" => 11, "a" => 1, "h" => 5)

#add new item to a dict
println(edict)
Output: Dict("jagdish" => 5000, "aniket" => 3500)
edict[“vivek”]=2700
println(edict)
Output: Dict("jagdish" => 5000, "vivek" => 2700, "aniket" => 3500)
#change dict vaue for a key
println(edict)
Output: Dict("jagdish" => 5000, "vivek" => 2700, "aniket" => 3500)
edict["vivek"]=4000
println(edict)
Output: Dict("jagdish" => 5000, "vivek" => 4000, "aniket" => 3500)

• Julia tuple và phương pháp tuple.
• Từ điển và phương pháp.

Tiếp tục hỗ trợ.