权限没有,则隐藏 function forum_list_access_filter($forumlist, $gid, $allow = 'allowread') { global $grouplist; if (empty($forumlist)) return array(); if (1 == $gid) return $forumlist; $forumlist_filter = $forumlist; $group = $grouplist[$gid]; foreach ($forumlist_filter as $fid => $forum) { if (empty($forum['accesson']) && empty($group[$allow]) || !empty($forum['accesson']) && empty($forum['accesslist'][$gid][$allow])) { unset($forumlist_filter[$fid]); } unset($forumlist_filter[$fid]['accesslist']); } return $forumlist_filter; } function forum_filter_moduid($moduids) { $moduids = trim($moduids); if (empty($moduids)) return ''; $arr = explode(',', $moduids); $r = array(); foreach ($arr as $_uid) { $_uid = intval($_uid); $_user = user_read($_uid); if (empty($_user)) continue; if ($_user['gid'] > 4) continue; $r[] = $_uid; } return implode(',', $r); } function forum_safe_info($forum) { //unset($forum['moduids']); return $forum; } function forum_filter($forumlist) { foreach ($forumlist as &$val) { unset($val['brief'], $val['announcement'], $val['seo_title'], $val['seo_keywords'], $val['create_date_fmt'], $val['icon_url'], $val['modlist']); } return $forumlist; } function forum_format_url($forum) { global $conf; if (0 == $forum['category']) { // 列表URL $url = url('list-' . $forum['fid'], '', FALSE); } elseif (1 == $forum['category']) { // 频道 $url = url('category-' . $forum['fid'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = url('read-' . trim($forum['brief']), '', FALSE); } if ($conf['url_rewrite_on'] > 1 && $forum['well_alias']) { if (0 == $forum['category'] || 1 == $forum['category']) { $url = url($forum['well_alias'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = ($forum['threads'] && $forum['brief']) ? url($forum['well_alias'] . '-' . trim($forum['brief']), '', FALSE) : url($forum['well_alias'], '', FALSE); } } return $url; } function well_forum_alias() { $forumlist = forum_list_cache(); if (empty($forumlist)) return ''; $key = 'forum-alias'; static $cache = array(); if (isset($cache[$key])) return $cache[$key]; $cache[$key] = array(); foreach ($forumlist as $val) { if ($val['well_alias']) $cache[$key][$val['fid']] = $val['well_alias']; } return array_flip($cache[$key]); } function well_forum_alias_cache() { global $conf; $key = 'forum-alias-cache'; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存,跨进程需要再加一层缓存:redis/memcached/xcache/apc if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $arr = well_forum_alias(); } else { $arr = cache_get($key); if (NULL === $arr) { $arr = well_forum_alias(); !empty($arr) AND cache_set($key, $arr); } } $cache[$key] = empty($arr) ? '' : $arr; return $cache[$key]; } ?>javascript - How to combine two array using ramda library? - Stack Overflow
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javascript - How to combine two array using ramda library? - Stack Overflow

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I have two array as below

const l1 = [ {"a": 1, "a1": 2}, {"b": 3, "b1": 4}, {"c": 5, "c1": 6} ];
const l2 = [ {"d": 2}, {"e": 2}, {"f": 2} ];

How can I use ramda library to bine these two and get result like

[ {"a": 1, "a1": 2, "d": 2}, {"a": 1, "a1": 2, "e": 2}, {"a": 1, "a1": 2, "f": 2}, 
{"b": 3, "b1": 4, "d": 2}, {"b": 3, "b1": 4, "e": 2}, {"b": 3, "b1": 4, "f": 2}, 
{"c": 5, "c1": 6, "d": 2}, {"c": 5, "c1": 6, "e": 2}, {"c": 5, "c1": 6, "f": 2} ]

I used

R.map(R.xprod(__, l2, l1)

But not working since i got object inside array.

Thanks in advance.

I have two array as below

const l1 = [ {"a": 1, "a1": 2}, {"b": 3, "b1": 4}, {"c": 5, "c1": 6} ];
const l2 = [ {"d": 2}, {"e": 2}, {"f": 2} ];

How can I use ramda library to bine these two and get result like

[ {"a": 1, "a1": 2, "d": 2}, {"a": 1, "a1": 2, "e": 2}, {"a": 1, "a1": 2, "f": 2}, 
{"b": 3, "b1": 4, "d": 2}, {"b": 3, "b1": 4, "e": 2}, {"b": 3, "b1": 4, "f": 2}, 
{"c": 5, "c1": 6, "d": 2}, {"c": 5, "c1": 6, "e": 2}, {"c": 5, "c1": 6, "f": 2} ]

I used

R.map(R.xprod(__, l2, l1)

But not working since i got object inside array.

Thanks in advance.

Share Improve this question asked Feb 14, 2020 at 7:20 DreamsDreams 8,50611 gold badges50 silver badges73 bronze badges
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4 Answers 4

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To get a Cartesian product of two arrays of objects you can create a function by lifting merge:

const fn = R.lift(R.merge)

const l1 = [ {"a": 1, "a1": 2}, {"b": 3, "b1": 4}, {"c": 5, "c1": 6} ];
const l2 = [ {"d": 2}, {"e": 2}, {"f": 2} ];

const result = fn(l1, l2)

console.log(result)
.as-console-wrapper { max-height: 100% !important; top: 0; }
<script src="https://cdnjs.cloudflare./ajax/libs/ramda/0.27.0/ramda.js" integrity="sha256-buL0byPvI/XRDFscnSc/e0q+sLA65O9y+rbF+0O/4FE=" crossorigin="anonymous"></script>

If not very particular about ramda, you can do as below with one line using flatMap and map.

const l1 = [
  { a: 1, a1: 2 },
  { b: 3, b1: 4 },
  { c: 5, c1: 6 }
];
const l2 = [{ d: 2 }, { e: 2 }, { f: 2 }];

const merged = l2.flatMap(item2 => l1.map(item1 => ({ ...item1, ...item2 })));
console.log(JSON.stringify(merged));

With plain Javascript, you could take cartesian product with a double nested reduce by mapping new objects.

This approach works for an arbirary count of arrays (sort of ...).

const
    l1 = [{ a: 1, a1: 2 }, { b: 3, b1: 4 }, { c: 5, c1: 6 }],
    l2 = [{ d: 2 }, { e: 2 }, { f: 2 }],
    result = [l1, l2].reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => ({ ...v, ...w }))), []));

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

There is another option to merge arrays using R.reduce function

const input = {
  arr1: ['a', 'b'],
  arr2: ['c', 'd']
}

R.pose(
  R.reduce((acc, cur) => {
    return [...acc, ...cur]
  }, []),
  R.map(([key, value]) => value),
  R.toPairs
)(input)
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