85 lines
1.8 KiB
JavaScript
85 lines
1.8 KiB
JavaScript
var reduce = require('../');
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var test = require('tape');
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test('numeric reduces', function (t) {
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t.plan(6);
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var xs = [ 1, 2, 3, 4 ];
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t.equal(
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reduce(xs, function (acc, x) { return acc + x }, 0),
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10
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);
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t.equal(
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reduce(xs, function (acc, x) { return acc + x }, 100),
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110
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);
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t.equal(
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reduce(xs, function (acc, x) { return acc + x }),
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10
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);
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var ys = cripple([ 1, 2, 3, 4 ]);
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t.equal(
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reduce(ys, function (acc, x) { return acc + x }, 0),
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10
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);
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t.equal(
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reduce(ys, function (acc, x) { return acc + x }, 100),
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110
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);
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t.equal(
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reduce(ys, function (acc, x) { return acc + x }),
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10
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);
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});
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test('holes', function (t) {
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t.plan(4);
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var xs = Array(10);
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xs[2] = 5; xs[4] = 6; xs[8] = 4;
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t.equal(
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reduce(xs, function (acc, x) { return acc + x }),
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15
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);
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t.equal(
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reduce(xs, function (acc, x) { return acc + x }, 100),
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115
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);
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var ys = cripple(Array(10));
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ys[2] = 5; ys[4] = 6; ys[8] = 4;
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t.equal(
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reduce(ys, function (acc, x) { return acc + x }),
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15
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);
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t.equal(
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reduce(ys, function (acc, x) { return acc + x }, 100),
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115
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);
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});
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test('object', function (t) {
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t.plan(1);
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var obj = { a: 3, b: 4, c: 5 };
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var res = reduce(objectKeys(obj), function (acc, key) {
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acc[key.toUpperCase()] = obj[key] * 111;
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return acc;
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}, {});
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t.deepEqual(res, { A: 333, B: 444, C: 555 });
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});
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function cripple (xs) {
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xs.reduce = undefined;
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return xs;
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}
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var objectKeys = function (obj) {
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var keys = [];
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for (var key in obj) {
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if (hasOwn.call(obj, key)) keys.push(key);
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}
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return keys;
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};
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var hasOwn = Object.prototype.hasOwnProperty;
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