| var concatMap = require('../'); |
| var test = require('tape'); |
| |
| test('empty or not', function (t) { |
| var xs = [ 1, 2, 3, 4, 5, 6 ]; |
| var ixes = []; |
| var ys = concatMap(xs, function (x, ix) { |
| ixes.push(ix); |
| return x % 2 ? [ x - 0.1, x, x + 0.1 ] : []; |
| }); |
| t.same(ys, [ 0.9, 1, 1.1, 2.9, 3, 3.1, 4.9, 5, 5.1 ]); |
| t.same(ixes, [ 0, 1, 2, 3, 4, 5 ]); |
| t.end(); |
| }); |
| |
| test('always something', function (t) { |
| var xs = [ 'a', 'b', 'c', 'd' ]; |
| var ys = concatMap(xs, function (x) { |
| return x === 'b' ? [ 'B', 'B', 'B' ] : [ x ]; |
| }); |
| t.same(ys, [ 'a', 'B', 'B', 'B', 'c', 'd' ]); |
| t.end(); |
| }); |
| |
| test('scalars', function (t) { |
| var xs = [ 'a', 'b', 'c', 'd' ]; |
| var ys = concatMap(xs, function (x) { |
| return x === 'b' ? [ 'B', 'B', 'B' ] : x; |
| }); |
| t.same(ys, [ 'a', 'B', 'B', 'B', 'c', 'd' ]); |
| t.end(); |
| }); |
| |
| test('undefs', function (t) { |
| var xs = [ 'a', 'b', 'c', 'd' ]; |
| var ys = concatMap(xs, function () {}); |
| t.same(ys, [ undefined, undefined, undefined, undefined ]); |
| t.end(); |
| }); |