scala execute inside the for loop

Question

As I know, the following expression

     for{i <- 0 to 10
         j <- 0 to 10} {...}

equals to

  for(i <- 0 to 10) {
     for(j <- 0 to 10) {
        .....
     }
  }

but, how to transform the following expression into the first case?

  for(i <- 0 to 10) {
     **execute()**
     for(j <- 0 to 10) {
        .....
     }
  }

Shadowlands · Accepted Answer · 2013-09-10 14:05:34Z

5

You can simply add in a line than runs the execution and stores the result in a variable. Eg.:

for{i <- 0 to 10;
    k = doSomethingWith(i);
    j <- 0 to 10} {... do something with any or all of i,j,k ...}

If the execution is side-effecting only (ie. return type is Unit), or you don't care about the return value, just assign to underscore. Eg:

for{i <- 0 to 10;
    _ = println(s"i = $i");
    j <- 0 to 10} {... do something with i,j ...}

answered Sep 10, 2013 at 14:05

Shadowlands

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