array repeating zeros in swift?

Question

I'm learning algorithms and data structures, I'm on a question that returns a array and squares it. sortedSquares is the variable name.

Recently, I looked up what it meant and I got a result that said that it was just a array that repeats zeros, but it seems like I could just use sortedSquares = [] with similar effect.

AlgoExpert is the platform that I'm using, so I cant upload all the code because of copyright stuff.

P.S. -- I'm 2 weeks into learning swift and any help would be great...thanks.

var sortedSquares = array(repeating: 0, from: array.count, by: 1)

With var sortedSquares = [], then sortedSquares is an Empty array... Print Array(repeating: 0...). Depending on array.count it could also be an empty array... — Larme
– Larme, Commented Nov 4, 2022 at 20:59
Just to be sure, are you new to programming? Or you know programming, but are just picking up Swift and Data Structure at the same time? — mfaani
– mfaani, Commented Nov 4, 2022 at 21:08
I’m almost certain that array(repeating: 0, from: array.count, by: 1) isn’t the actual code. Please show the actual, code. (or that’s really it, it’s using a function you haven’t shown us, which you would need to do) — Alexander
– Alexander, Commented Nov 5, 2022 at 3:32

Duncan C · Accepted Answer · 2022-11-04 21:38:11Z

1

Sometimes you need an empty array (no elements) and other times you need an array pre-filled with a certain number of placeholder values. Using Array.init(repeating:0) will populate your array with zeros, which is not the same thing as an empty array.

var ints: [Int]

// after this line, print(array.count) disaplays 0, and `array.isEmpty` evaluates to true
ints = [] 

// after this line, print(array.count) returns 10, and print(array) 
// prints an array of 10 zeros. Also `array.isEmpty` evaluates to false.    
ints = Array(repeating: 0, count: 10)

answered Nov 4, 2022 at 21:38

Duncan C

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Duncan C Over a year ago

If this answers your question you should accept it. That’s a strong norm on Stack Overflow. Up-votes are entirely optional, but you are expected to accept the first answer that solves our problem (or the best answer if a later answer is substantially better.)

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