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var assert = require('assert');
var R = require('../source');var eq = require('./shared/eq');

describe('flatten', function() {  it('turns a nested list into one flat list', function() {    var nest = [1, [2], [3, [4, 5], 6, [[[7], 8]]], 9, 10];    eq(R.flatten(nest), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);    nest = [[[[3]], 2, 1], 0, [[-1, -2], -3]];    eq(R.flatten(nest), [3, 2, 1, 0, -1, -2, -3]);    eq(R.flatten([1, 2, 3, 4, 5]), [1, 2, 3, 4, 5]);  });
  it('is not destructive', function() {    var nest = [1, [2], [3, [4, 5], 6, [[[7], 8]]], 9, 10];    assert.notStrictEqual(R.flatten(nest), nest);  });
  it('handles ridiculously large inputs', function() {    this.timeout(10000);    eq(R.flatten([new Array(1000000), R.range(0, 56000), 5, 1, 3]).length, 1056003);  });
  it('handles array-like objects', function() {    var o = {length: 3, 0: [1, 2, [3]], 1: [], 2: ['a', 'b', 'c', ['d', 'e']]};    eq(R.flatten(o), [1, 2, 3, 'a', 'b', 'c', 'd', 'e']);  });
  it('flattens an array of empty arrays', function() {    eq(R.flatten([[], [], []]), []);    eq(R.flatten([]), []);  });
});