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authorMartijn Visser <mgvisser@gmail.com>2018-08-14 18:00:00 +0200
committerMartijn Visser <mgvisser@gmail.com>2018-08-14 18:00:00 +0200
commitcf5cc6b76cb3978818dc98feef86f62b1b406e63 (patch)
treeb87855c8fd840332f85ec9fd008e91131b1c40dc /julia.html.markdown
parente9dd72024cee9805f9d763387d4c848a316a7307 (diff)
autoformat with VS code
mostly just spaces between arguments
Diffstat (limited to 'julia.html.markdown')
-rw-r--r--julia.html.markdown140
1 files changed, 70 insertions, 70 deletions
diff --git a/julia.html.markdown b/julia.html.markdown
index d55a166b..2e4e7c48 100644
--- a/julia.html.markdown
+++ b/julia.html.markdown
@@ -31,7 +31,7 @@ This is based on Julia 1.0.0
3 # => 3 (Int64)
3.2 # => 3.2 (Float64)
2 + 1im # => 2 + 1im (Complex{Int64})
-2//3 # => 2//3 (Rational{Int64})
+2 // 3 # => 2//3 (Rational{Int64})
# All of the normal infix operators are available.
1 + 1 # => 2
@@ -41,7 +41,7 @@ This is based on Julia 1.0.0
5 / 2 # => 2.5 # dividing an Int by an Int always results in a Float
div(5, 2) # => 2 # for a truncated result, use div
5 \ 35 # => 7.0
-2 ^ 2 # => 4 # power, not bitwise xor
+2^2 # => 4 # power, not bitwise xor
12 % 10 # => 2
# Enforce precedence with parentheses
@@ -83,7 +83,7 @@ false
# Strings are created with "
try
-"This is a string."
+ "This is a string."
catch ; end
# Julia has several types of strings, including ASCIIString and UTF8String.
@@ -91,19 +91,19 @@ catch ; end
# Character literals are written with '
try
-'a'
+ 'a'
catch ; end
# Some strings can be indexed like an array of characters
try
-"This is a string"[1] # => 'T' # Julia indexes from 1
+ "This is a string"[1] # => 'T' # Julia indexes from 1
catch ; end
# However, this is will not work well for UTF8 strings,
# so iterating over strings is recommended (map, for loops, etc).
# $ can be used for string interpolation:
try
-"2 + 2 = $(2 + 2)" # => "2 + 2 = 4"
+ "2 + 2 = $(2 + 2)" # => "2 + 2 = 4"
catch ; end
# You can put any Julia expression inside the parentheses.
@@ -116,7 +116,7 @@ println("I'm Julia. Nice to meet you!")
# String can be compared lexicographically
"good" > "bye" # => true
"good" == "good" # => true
-"1 + 2 = 3" == "1 + 2 = $(1+2)" # => true
+"1 + 2 = 3" == "1 + 2 = $(1 + 2)" # => true
####################################################
## 2. Variables and Collections
@@ -172,17 +172,17 @@ matrix = [1 2; 3 4] # => 2x2 Int64 Array: [1 2; 3 4]
b = Int8[4, 5, 6] # => 3-element Int8 Array: [4, 5, 6]
# Add stuff to the end of a list with push! and append!
-push!(a,1) # => [1]
-push!(a,2) # => [1,2]
-push!(a,4) # => [1,2,4]
-push!(a,3) # => [1,2,4,3]
-append!(a,b) # => [1,2,4,3,4,5,6]
+push!(a, 1) # => [1]
+push!(a, 2) # => [1,2]
+push!(a, 4) # => [1,2,4]
+push!(a, 3) # => [1,2,4,3]
+append!(a, b) # => [1,2,4,3,4,5,6]
# Remove from the end with pop
pop!(b) # => 6 and b is now [4,5]
# Let's put it back
-push!(b,6) # b is now [4,5,6] again.
+push!(b, 6) # b is now [4,5,6] again.
a[1] # => 1 # remember that Julia indexes from 1, not 0!
@@ -192,7 +192,7 @@ a[end] # => 6
# we also have shift and unshift
shift!(a) # => 1 and a is now [2,4,3,4,5,6]
-unshift!(a,7) # => [7,2,4,3,4,5,6]
+unshift!(a, 7) # => [7,2,4,3,4,5,6]
# Function names that end in exclamations points indicate that they modify
# their argument.
@@ -203,7 +203,7 @@ sort!(arr) # => [4,5,6]; arr is now [4,5,6]
# Looking out of bounds is a BoundsError
try
a[0] # => ERROR: BoundsError() in getindex at array.jl:270
- a[end+1] # => ERROR: BoundsError() in getindex at array.jl:270
+ a[end + 1] # => ERROR: BoundsError() in getindex at array.jl:270
catch e
println(e)
end
@@ -221,11 +221,11 @@ a[2:end] # => [2, 3, 4, 5]
# Remove elements from an array by index with splice!
arr = [3,4,5]
-splice!(arr,2) # => 4 ; arr is now [3,5]
+splice!(arr, 2) # => 4 ; arr is now [3,5]
# Concatenate lists with append!
b = [1,2,3]
-append!(a,b) # Now a is [1, 2, 3, 4, 5, 1, 2, 3]
+append!(a, b) # Now a is [1, 2, 3, 4, 5, 1, 2, 3]
# Check for existence in a list with in
in(1, a) # => true
@@ -236,7 +236,7 @@ length(a) # => 8
# Tuples are immutable.
tup = (1, 2, 3) # => (1,2,3) # an (Int64,Int64,Int64) tuple.
tup[1] # => 1
-try:
+ try:
tup[1] = 3 # => ERROR: no method setindex!((Int64,Int64,Int64),Int64,Int64)
catch e
println(e)
@@ -265,7 +265,7 @@ e, d = d, e # => (5,4) # d is now 5 and e is now 4
empty_dict = Dict() # => Dict{Any,Any}()
# You can create a dictionary using a literal
-filled_dict = Dict("one"=> 1, "two"=> 2, "three"=> 3)
+filled_dict = Dict("one" => 1, "two" => 2, "three" => 3)
# => Dict{ASCIIString,Int64}
# Look up values with []
@@ -296,8 +296,8 @@ end
# Use the get method to avoid that error by providing a default value
# get(dictionary,key,default_value)
-get(filled_dict,"one",4) # => 1
-get(filled_dict,"four",4) # => 4
+get(filled_dict, "one", 4) # => 1
+get(filled_dict, "four", 4) # => 4
# Use Sets to represent collections of unordered, unique values
empty_set = Set() # => Set{Any}()
@@ -305,7 +305,7 @@ empty_set = Set() # => Set{Any}()
filled_set = Set([1,2,2,3,4]) # => Set{Int64}(1,2,3,4)
# Add more values to a set
-push!(filled_set,5) # => Set{Int64}(5,4,2,3,1)
+push!(filled_set, 5) # => Set{Int64}(5,4,2,3,1)
# Check if the values are in the set
in(2, filled_set) # => true
@@ -315,7 +315,7 @@ in(10, filled_set) # => false
other_set = Set([3, 4, 5, 6]) # => Set{Int64}(6,4,5,3)
intersect(filled_set, other_set) # => Set{Int64}(3,4,5)
union(filled_set, other_set) # => Set{Int64}(1,2,3,4,5,6)
-setdiff(Set([1,2,3,4]),Set([2,3,5])) # => Set{Int64}(1,4)
+setdiff(Set([1,2,3,4]), Set([2,3,5])) # => Set{Int64}(1,4)
####################################################
@@ -338,7 +338,7 @@ end
# For loops iterate over iterables.
# Iterable types include Range, Array, Set, Dict, and AbstractString.
-for animal=["dog", "cat", "mouse"]
+for animal = ["dog", "cat", "mouse"]
println("$animal is a mammal")
# You can use $ to interpolate variables or expression into strings
end
@@ -356,7 +356,7 @@ end
# cat is a mammal
# mouse is a mammal
-for a in Dict("dog"=>"mammal","cat"=>"mammal","mouse"=>"mammal")
+for a in Dict("dog" => "mammal", "cat" => "mammal", "mouse" => "mammal")
println("$(a[1]) is a $(a[2])")
end
# prints:
@@ -364,7 +364,7 @@ end
# cat is a mammal
# mouse is a mammal
-for (k,v) in Dict("dog"=>"mammal","cat"=>"mammal","mouse"=>"mammal")
+for (k, v) in Dict("dog" => "mammal", "cat" => "mammal", "mouse" => "mammal")
println("$k is a $v")
end
# prints:
@@ -386,9 +386,9 @@ end
# Handle exceptions with a try/catch block
try
- error("help")
+ error("help")
catch e
- println("caught it $e")
+ println("caught it $e")
end
# => caught it ErrorException("help")
@@ -426,7 +426,7 @@ function varargs(args...)
end
# => varargs (generic function with 1 method)
-varargs(1,2,3) # => (1,2,3)
+varargs(1, 2, 3) # => (1,2,3)
# The ... is called a splat.
# We just used it in a function definition.
@@ -434,18 +434,18 @@ varargs(1,2,3) # => (1,2,3)
# where it will splat an Array or Tuple's contents into the argument list.
add([5,6]...) # this is equivalent to add(5,6)
-x = (5,6) # => (5,6)
+x = (5, 6) # => (5,6)
add(x...) # this is equivalent to add(5,6)
# You can define functions with optional positional arguments
-function defaults(a,b,x=5,y=6)
+function defaults(a, b, x=5, y=6)
return "$a $b and $x $y"
end
-defaults('h','g') # => "h g and 5 6"
-defaults('h','g','j') # => "h g and j 6"
-defaults('h','g','j','k') # => "h g and j k"
+defaults('h', 'g') # => "h g and 5 6"
+defaults('h', 'g', 'j') # => "h g and j 6"
+defaults('h', 'g', 'j', 'k') # => "h g and j k"
try
defaults('h') # => ERROR: no method defaults(Char,)
defaults() # => ERROR: no methods defaults()
@@ -454,8 +454,8 @@ catch e
end
# You can define functions that take keyword arguments
-function keyword_args(;k1=4,name2="hello") # note the ;
- return Dict("k1"=>k1,"name2"=>name2)
+function keyword_args(;k1=4, name2="hello") # note the ;
+ return Dict("k1" => k1, "name2" => name2)
end
keyword_args(name2="ness") # => ["name2"=>"ness","k1"=>4]
@@ -508,7 +508,7 @@ map(add_10, [1,2,3]) # => [11, 12, 13]
filter(x -> x > 5, [3, 4, 5, 6, 7]) # => [6, 7]
# We can use list comprehensions for nicer maps
-[add_10(i) for i=[1, 2, 3]] # => [11, 12, 13]
+[add_10(i) for i = [1, 2, 3]] # => [11, 12, 13]
[add_10(i) for i in [1, 2, 3]] # => [11, 12, 13]
####################################################
@@ -537,16 +537,16 @@ typeof(DataType) # => DataType
# ...
# end
type Tiger
- taillength::Float64
- coatcolor # not including a type annotation is the same as `::Any`
+ taillength::Float64
+ coatcolor # not including a type annotation is the same as `::Any`
end
# The default constructor's arguments are the properties
# of the type, in the order they are listed in the definition
-tigger = Tiger(3.5,"orange") # => Tiger(3.5,"orange")
+tigger = Tiger(3.5, "orange") # => Tiger(3.5,"orange")
# The type doubles as the constructor function for values of that type
-sherekhan = typeof(tigger)(5.6,"fire") # => Tiger(5.6,"fire")
+sherekhan = typeof(tigger)(5.6, "fire") # => Tiger(5.6,"fire")
# These struct-style types are called concrete types
# They can be instantiated, but cannot have subtypes.
@@ -588,19 +588,19 @@ supertype(DirectIndexString) # => AbstractString
# <: is the subtyping operator
type Lion <: Cat # Lion is a subtype of Cat
- mane_color
- roar::AbstractString
+ mane_color
+ roar::AbstractString
end
# You can define more constructors for your type
# Just define a function of the same name as the type
# and call an existing constructor to get a value of the correct type
-Lion(roar::AbstractString) = Lion("green",roar)
+Lion(roar::AbstractString) = Lion("green", roar)
# This is an outer constructor because it's outside the type definition
type Panther <: Cat # Panther is also a subtype of Cat
- eye_color
- Panther() = new("green")
+ eye_color
+ Panther() = new("green")
# Panthers will only have this constructor, and no default constructor.
end
# Using inner constructors, like Panther does, gives you control
@@ -619,30 +619,30 @@ end
# Definitions for Lion, Panther, Tiger
function meow(animal::Lion)
- animal.roar # access type properties using dot notation
+ animal.roar # access type properties using dot notation
end
function meow(animal::Panther)
- "grrr"
+ "grrr"
end
function meow(animal::Tiger)
- "rawwwr"
+ "rawwwr"
end
# Testing the meow function
meow(tigger) # => "rawwr"
-meow(Lion("brown","ROAAR")) # => "ROAAR"
+meow(Lion("brown", "ROAAR")) # => "ROAAR"
meow(Panther()) # => "grrr"
# Review the local type hierarchy
-issubtype(Tiger,Cat) # => false
-issubtype(Lion,Cat) # => true
-issubtype(Panther,Cat) # => true
+issubtype(Tiger, Cat) # => false
+issubtype(Lion, Cat) # => true
+issubtype(Panther, Cat) # => true
# Defining a function that takes Cats
function pet_cat(cat::Cat)
- println("The cat says $(meow(cat))")
+ println("The cat says $(meow(cat))")
end
pet_cat(Lion("42")) # => prints "The cat says 42"
@@ -657,47 +657,47 @@ end
# In Julia, all of the argument types contribute to selecting the best method.
# Let's define a function with more arguments, so we can see the difference
-function fight(t::Tiger,c::Cat)
- println("The $(t.coatcolor) tiger wins!")
+function fight(t::Tiger, c::Cat)
+ println("The $(t.coatcolor) tiger wins!")
end
# => fight (generic function with 1 method)
-fight(tigger,Panther()) # => prints The orange tiger wins!
-fight(tigger,Lion("ROAR")) # => prints The orange tiger wins!
+fight(tigger, Panther()) # => prints The orange tiger wins!
+fight(tigger, Lion("ROAR")) # => prints The orange tiger wins!
# Let's change the behavior when the Cat is specifically a Lion
-fight(t::Tiger,l::Lion) = println("The $(l.mane_color)-maned lion wins!")
+fight(t::Tiger, l::Lion) = println("The $(l.mane_color)-maned lion wins!")
# => fight (generic function with 2 methods)
-fight(tigger,Panther()) # => prints The orange tiger wins!
-fight(tigger,Lion("ROAR")) # => prints The green-maned lion wins!
+fight(tigger, Panther()) # => prints The orange tiger wins!
+fight(tigger, Lion("ROAR")) # => prints The green-maned lion wins!
# We don't need a Tiger in order to fight
-fight(l::Lion,c::Cat) = println("The victorious cat says $(meow(c))")
+fight(l::Lion, c::Cat) = println("The victorious cat says $(meow(c))")
# => fight (generic function with 3 methods)
-fight(Lion("balooga!"),Panther()) # => prints The victorious cat says grrr
+fight(Lion("balooga!"), Panther()) # => prints The victorious cat says grrr
try
- fight(Panther(),Lion("RAWR"))
+ fight(Panther(), Lion("RAWR"))
catch e
- println(e)
+ println(e)
# => MethodError(fight, (Panther("green"), Lion("green", "RAWR")), 0x000000000000557b)
end
# Also let the cat go first
-fight(c::Cat,l::Lion) = println("The cat beats the Lion")
+fight(c::Cat, l::Lion) = println("The cat beats the Lion")
# This warning is because it's unclear which fight will be called in:
try
- fight(Lion("RAR"),Lion("brown","rarrr")) # => prints The victorious cat says rarrr
+ fight(Lion("RAR"), Lion("brown", "rarrr")) # => prints The victorious cat says rarrr
catch e
- println(e)
+ println(e)
# => MethodError(fight, (Lion("green", "RAR"), Lion("brown", "rarrr")), 0x000000000000557c)
end
# The result may be different in other versions of Julia
-fight(l::Lion,l2::Lion) = println("The lions come to a tie")
-fight(Lion("RAR"),Lion("brown","rarrr")) # => prints The lions come to a tie
+fight(l::Lion, l2::Lion) = println("The lions come to a tie")
+fight(Lion("RAR"), Lion("brown", "rarrr")) # => prints The lions come to a tie
# Under the hood