CODEWITHSUNDEEP
scalascala-collections
user1756420
user1756420

Reputation: 49

Scala: Append on list to other list with reassignment: Reassignment to val error

I know i can concat two lists a & b to result c like this in scala. But how can i do same thing if i do not want extra variable c and hold result in variable a.

 val a = List(1,2,3)
 val b = List(4,5,6)
 val c = a ::: b (I do not want this extra variable c and want to hold result in val a only)

Basically appending List b to List a:
Something like [ a = a ::: b]
This is giving me error: Reassignment to val.

Upvotes: 1

Views: 402

Answers (3)

igx
igx

Reputation: 4231

You can treat it as a:::b anywhere in your code . BUT note that even if you define a new val c = a:::b it does not allocate more memory size (as the size of a and b). it uses data sharing of a and b so it good practice to create a new val if it makes your code more readable (or makes your life easier) otherwise just use a:::b . in general it is a better practice than using a 'var'

Upvotes: 0

Avinash Anand
Avinash Anand

Reputation: 695

Use var instead of val. val can't be re-assigned.

Upvotes: 1

Bruno Grieder
Bruno Grieder

Reputation: 29814

A val is final. Once a value has been assigned to it (List(1,2,3)), a new value cannot be reassigned to it. Use a var

Upvotes: 3

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