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(); });