The “corresponds” function lets you match up items between two lists. For a good use of this, imagine you have a list of values, and a list of ranges (e.g. numeric or time windows):<\/p>\n
\nval a = List(1, 2, 3, 4)\nval b = List((1,4), (2,5), (3,7), (3,11))\n<\/pre>\nFrom that, you can write a function that compares one item to a range tuple:<\/p>\n
\nval cmp = \n (k: Int, v: (Int, Int)) => { \n val (start, end) = v \n k >= start && k < end \n }\n\ncmp: (Int, (Int, Int)) => Boolean = \n<\/pre>\nAnd then call corresponds (note the two sets of parenthesis):<\/p>\n
\nscala> a.corresponds(b)(cmp)\n\nres22: Boolean = true\n<\/pre>\nThis works as expected. If the arrays aren’t of the same length, you’ll also get ‘false’ as expected:<\/p>\n
\nval a = List(1,2,3)\n\na.corresponds(b)(cmp)\nres24: Boolean = false\n<\/pre>\n","protected":false},"excerpt":{"rendered":"The “corresponds” function lets you match up items between two lists. For a good use of this, imagine you have a list of values, and a list of ranges (e.g. numeric or time windows): val a = List(1, 2, 3, 4) val b = List((1,4), (2,5), (3,7), (3,11)) From that, you can write a function … <\/p>\n