Swift 2D Array add 1D Array(使用 append)

var test2arr:[[Float]] = []

var test1arr:[Float] = [1.0,2.0,3.0]

test2arr.append(test1arr)

test1arr = [4.0,5.0,6.0]

test2arr.append(test1arr)

print(test2arr)

//[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]]