Current File : /var/www/html/node_modules/array.prototype.flatmap/test/tests.js
'use strict';
var inspect = require('object-inspect');
var forEach = require('foreach');
module.exports = function (flatMap, t) {
t.test('callback function', function (st) {
forEach([[], {}, true, false, 42, 'foo', /a/g, null], function (nonFunction) {
st['throws'](
function () { flatMap([], nonFunction); },
TypeError,
inspect(nonFunction) + ' is not a function'
);
});
st.end();
});
t.test('flatMaps', function (st) {
var mapped = flatMap([1, [2], [3, 4]], function (x, i) {
return [x, i];
});
var expected = [1, 0, [2], 1, [3, 4], 2];
st.deepEqual(mapped, expected, 'array is flattened and mapped to tuples of item/index');
st.equal(mapped.length, expected.length, 'array has expected length');
var context = {};
var actual;
flatMap([1], function () { actual = this; }, context);
st.equal(actual, context, 'thisArg works as expected');
st.end();
});
t.test('sparse arrays', function (st) {
var identity = function (x) { return x; };
// eslint-disable-next-line no-sparse-arrays
st.deepEqual(flatMap([, [1]], identity), flatMap([[], [1]], identity), 'an array hole is treated the same as an empty array');
st.end();
});
};
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