go - Golang sort.Swap Method -

i new golang, although have written lines of code. exploring sorting options when found this^(src):

func (p stringslice) swap(i, j int)      { p[i], p[j] = p[j], p[i] } 

i have no clue going on there. explain me p[i], p[j] = p[j], p[i] doing?

thanks.

it name says: swaps i^th , j^th elements.

it assignment, more tuple assignment:

p[i], p[j] = p[j], p[i] 

it assigns values p[i] , p[j], , values assigned them in order p[j] , p[i].

the assignment proceeds in 2 phases. first, operands of index expressions , pointer indirections (including implicit pointer indirections in selectors) on left , expressions on right evaluated in usual order. second, assignments carried out in left-to-right order.