te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - Join Array of Objects by Property using lodash - Stack Overflow

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    javascript - Join Array of Objects by Property using lodash - Stack Overflow

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    Is there a way using lodash or another library to join an array of objects?

    I'm looking for a readymade function not a for loop.

    For example:

    [{a: 1}, {a:3}, {a: 4}]
      //Run a function by specifing the property a and setting "," as the delimeter
Get 1,3,4

    Is there a way using lodash or another library to join an array of objects?

    I'm looking for a readymade function not a for loop.

    For example:

    [{a: 1}, {a:3}, {a: 4}]
      //Run a function by specifing the property a and setting "," as the delimeter
Get 1,3,4
    • javascript
    • arrays
    Share Improve this question asked Jul 28, 2016 at 23:15 KingKongFrogKingKongFrog 14.4k22 gold badges76 silver badges131 bronze badges
    Add a ment  | 

    2 Answers 2

    Reset to default 10

    Here is your lodash answer

    var arr = [{a: 1}, {a:3}, {a: 4}];
var s = _.map(arr, 'a').join(',');
//s == '1,2,3,4'

    You don't need lodash for this, you can just use map and join:

    let collection = [{a: 1}, {a:3}, {a: 4}];
alert(collection.map(item => item.a).join(','));

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