# [Solved] What is the most efficient way to transform of seq of X to a seq of Y

user16367669 Asks: What is the most efficient way to transform of seq of X to a seq of Y
I have a `Seq` of objects like `Seq(x1, x2, x3, x4)` and I want to tranform it to `Seq(y1, y2, y3, y4)`

What is the most efficient way of doing so

Right now I am

Code:
``````val seq1 = Seq(x1, x2, x3......)
var seq2 = Seq[MyType2]()

for (myObj <- seq1) {
seq2 = seq2 :+ myObj.tranformToType2
}``````

The problem is that the scala doc says

Scala Standard Library 2.12.15 – scala.collection.Seq

a new sequence consisting of all elements of this sequence followed by elem.

so I was wondering what is the most idiomatic/efficient way of tranforming a list of object to another list of object

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