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author0u0 <inkydragon@users.noreply.github.com>2018-08-31 09:45:50 +0800
committer0u0 <inkydragon@users.noreply.github.com>2018-08-31 09:45:50 +0800
commit4fcac31e9cfe169f006244dbdb01d0d16fa696e5 (patch)
treecec30b48d168bf10cfc257b78d927eaf00643301 /julia.html.markdown
parent5691fb7a8d824a879a8d4391a93c50f27be1ec25 (diff)
ry to use as few words as possible
Diffstat (limited to 'julia.html.markdown')
-rw-r--r--julia.html.markdown48
1 files changed, 33 insertions, 15 deletions
diff --git a/julia.html.markdown b/julia.html.markdown
index 416f1a5a..54860fca 100644
--- a/julia.html.markdown
+++ b/julia.html.markdown
@@ -170,10 +170,12 @@ 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]
+pop!(b) # => 6
+b # => [4,5]
# Let's put it back
-push!(b, 6) # b is now [4,5,6] again.
+push!(b, 6) # => [4,5,6]
+b # => [4,5,6]
a[1] # => 1 # remember that Julia indexes from 1, not 0!
@@ -182,14 +184,18 @@ a[1] # => 1 # remember that Julia indexes from 1, not 0!
a[end] # => 6
# we also have popfirst! and pushfirst!
-popfirst!(a) # => 1 and a is now [2,4,3,4,5,6]
+popfirst!(a) # => 1
+a # => [2,4,3,4,5,6]
pushfirst!(a, 7) # => [7,2,4,3,4,5,6]
+a # => [7,2,4,3,4,5,6]
# Function names that end in exclamations points indicate that they modify
# their argument.
-sort(arr) # => [4,5,6]; arr is still [5,4,6]
-sort!(arr) # => [4,5,6]; arr is now [4,5,6]
arr = [5,4,6] # => 3-element Array{Int64,1}: [5,4,6]
+sort(arr) # => [4,5,6]
+arr # => [5,4,6]
+sort!(arr) # => [4,5,6]
+arr # => [4,5,6]
# Looking out of bounds is a BoundsError
try
@@ -227,11 +233,13 @@ 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 # => [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) # => [1, 2, 3, 4, 5, 1, 2, 3]
+a # => [1, 2, 3, 4, 5, 1, 2, 3]
# Check for existence in a list with in
in(1, a) # => true
@@ -240,8 +248,9 @@ in(1, a) # => true
length(a) # => 8
# Tuples are immutable.
-tup = (1, 2, 3) # => (1,2,3) # an (Int64,Int64,Int64) tuple.
-tup[1] # => 1
+tup = (1, 2, 3) # => (1,2,3)
+typeof(tup) # => Tuple{Int64,Int64,Int64}
+tup[1] # => 1
try
tup[1] = 3
# => ERROR: MethodError: no method matching
@@ -251,23 +260,30 @@ catch e
end
# Many array functions also work on tuples
-length(tup) # => 3
-tup[1:2] # => (1,2)
+length(tup) # => 3
+tup[1:2] # => (1,2)
in(2, tup) # => true
# You can unpack tuples into variables
-a, b, c = (1, 2, 3) # => (1,2,3) # a is now 1, b is now 2 and c is now 3
+a, b, c = (1, 2, 3) # => (1,2,3)
+a # => 1
+b # => 2
+c # => 3
# Tuples are created even if you leave out the parentheses
d, e, f = 4, 5, 6 # => (4,5,6)
+d # => 4
+e # => 5
+f # => 6
# A 1-element tuple is distinct from the value it contains
(1,) == 1 # => false
(1) == 1 # => true
# Look how easy it is to swap two values
-e, d = d, e # => (5,4) # d is now 5 and e is now 4
-
+e, d = d, e # => (5,4)
+d # => 5
+e # => 4
# Dictionaries store mappings
empty_dict = Dict() # => Dict{Any,Any} with 0 entries
@@ -419,7 +435,9 @@ function add(x, y)
x + y
end
-add(5, 6) # => 11 after printing out "x is 5 and y is 6"
+add(5, 6)
+# => x is 5 and y is 6
+# => 11
# Compact assignment of functions
f_add(x, y) = x + y # => f_add (generic function with 1 method)