Swift array to array of tuples

Use zip and map:

let xaxis = ["monday", "tuesday", "wednesday", "thursday", "friday"]
let yaxis = [1, 2, 3, 4, 5]

let tuples = zip(xaxis, yaxis).map { ($0, $1) }

Try this:

let xaxis = ["monday", "tuesday", "wednesday", "thursday", "friday"]

let yaxis = [1, 2, 3, 4, 5]

var newArr = [(String, Int)]()

for i in 0..<xaxis.count {
        newArr.append((xaxis[i], yaxis[i]))
}
print(newArr)

Try this:

let arrayMerged = zip(xaxis, yaxis).map { ($0, $1) }

or this:

let arrayMerged = Array(zip(xaxis, yaxis))