This question already has answers here:
How to change the position of an array element?
(8 answers)
Closed 6 years ago.
I have an array of arrays like this:
[['a','b','c'],['d','e','f'],['g','h','i'],['j','k','l']]
Now I want to move the last array ['j','k','l'] after array ['a','b','c'] and before array ['d','e','f']. How can I do this?
array.insert(1, array.delete_at(3))
This should do it.
Related
This question already has answers here:
How to determine if one array contains all elements of another array
(8 answers)
Closed 4 years ago.
how can i compare if an array of strings contains a smaller array of strings in Ruby?
e.g.
a=["1","2","3","4","5"]
b=["2","3"]
now i want to check if a contains b and get true/false
Thanks.
The most common approach would be to
(b - a).empty?
It has issues with unique elements, though. To detect whether a includes all elements from b, one should:
a_copy = a.dup
b.all? { |e| a_copy.delete e }
# or
b.all?(&a_copy.method(:delete))
This question already has answers here:
Swift 3 2d array of Int
(2 answers)
Closed 5 years ago.
var tri = [[Int]]();
tri[0][0] = 321;
This code causes this error:
fatal error: Index out of range
What's wrong?
You're accessing the first element of the first subarray of the array. But your array doesn't contain any subarrays, so it crashes.
This question already has answers here:
Swift 3.0 iterate over String.Index range
(10 answers)
Convert Swift string to array
(14 answers)
Closed 5 years ago.
Would it be possible to loop through each character in the string, and then place each character into an array?
I'm new to swift, and I'm trying to figure this out. Could someone write a code for this?
It's really simple:
let str = "My String"
let letters = str.characters.map({String($0)})
print(letters)
This question already has answers here:
How do I convert a Swift Array to a String?
(25 answers)
Closed 5 years ago.
I know that if I want to convert an array of Ints to a String, I do this:
[0,1,1,0].map{"\($0)"}.reduce(""){$0+$1}
but I cannot figure out how would I convert an array of Ints to a comma separated String
Well you can do it like :
let formattedArray = ([0,1,1,0].map{String($0)}.joined(separator: ",")
This question already has answers here:
Unique (non-repeating) random numbers in O(1)?
(22 answers)
Unique random number generation in an integer array [duplicate]
(9 answers)
Closed 8 years ago.
I want to randomize number in each element of array in a variabel. I currently use srand() function. But, with this function i could get a same number in two or more element of array.
the output of my program is
number[0]=6
number[1]=3
number[2]=8
number[3]=3
See, number[1] and number[3] has same value. How to prevent this thing happen?