Best way to fill an array with elements from another array, scala

Question

I got two array of characters, looking like this:

a, b, c, d, e, f, g

k, e, y

and im need to associate each element from first array to elements from second, like this:

a->k,

b->e,

c->y,

d->k,

e->e,

f->y,

g->k

but dont know how to implement this in functional style. Any help will be appreciated!

Marth · Accepted Answer · 2015-06-25 10:13:47Z

7

You could zip the first Array with a continuous Stream :

scala> val a1 = Array('a,'b,'c,'d,'e,'f,'g)
a1: Array[Symbol] = Array('a, 'b, 'c, 'd, 'e, 'f, 'g)

scala> val a2 = Array('k,'e,'y)
a2: Array[Symbol] = Array('k, 'e, 'y)

scala> val a3 = a1 zip (Stream.continually(a2).flatten)
a3: Array[(Symbol, Symbol)] = Array(('a,'k), ('b,'e), ('c,'y), ('d,'k),
                                    ('e,'e), ('f,'y), ('g,'k))

answered Jun 25, 2015 at 10:13

Marth

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2 Comments

Jörg W Mittag Over a year ago

Or Map(a1.zip(Stream.continually(a2).flatten):_*) in case the OP wants a Map from elements of a1 to elements of a2. (It's not quite clear from the question.)

DoSofRedRiver Over a year ago

@JörgWMittag sorry for that. Il just want to get array, that look like values collection in that answer. Already solved.

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