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| 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();
| });
|
|
