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