Swift: Using a for-in loop, find the largest value in an Int array-CodePudding

Sorry guys, I'm new here and I'm learning iOS developing from scratch.

I know that in order to find the largest value in an array of Int, we can use the propertie ".max()". But I need to do this using a for-in loop. Would someone please help me? I know it's so easy, but I can't find it and can't find out how to do it on my own as well. Thanks.

CodePudding user response：

Well the complexity of array.max() of Swift is O(N) just like the for-in loop.

There are two ways to for-in in Swift.

First solution (for-in here like for each value)

let arr = [1, 4, 3]
var max = Int.min

// get each value
for val in arr {
    if (max < val) {
        max = val
    }
}

Second solution (for-in here is for each index)

let arr = [1, 4, 3]
var max = Int.min

// get each index
for i in 0..<arr.count {
    if (max < arr[i]) {
        max = arr[i]
    }
}

Two ways have the same output. Feel free when choosing which to use in your further code.