通过数组数据进行迭代

时间:2013-04-04 04:36:22

标签: ruby json recursion foreach

我有一个JSON数据,格式如下:

 [{
        "id": 1,
        "children": [{
                "id": 7,
                "children": [{
                        "id": 8,
                        "children": [{
                                "id": 4
                            }, {
                                "id": 5
                            }, {
                                "id": 11
                            }
                        ]
                    }, {
                        "id": 9
                    }
                ]
            }, {
                "id": 6
            }, {
                "id": 10
            }
        ]
    }, {
        "id": 2,
        "children": [{
                "id": 3
            }, {
                "id": 12
            }
        ]
    }, {
        "id": 13
    }
]

此JSON数据的树是:

enter image description here

我想遍历所有节点并提取维护其父子层次结构的所有数据的“id”。我怎么能用递归函数来做到这一点。

这个想法是用ruby解析json结构。

1 个答案:

答案 0 :(得分:1)

我刚刚编写了一个节点js代码,您仍然可以在js中使用浏览器,但是您需要下载下划线库here

_und = require('underscore');

data = [{
        "id": 1,
        "children": [{
                "id": 7,
                "children": [{
                        "id": 8,
                        "children": [{
                                "id": 4
                            }, {
                                "id": 5
                            }, {
                                "id": 11
                            }
                        ]
                    }, {
                        "id": 9
                    }
                ]
            }, {
                "id": 6
            }, {
                "id": 10
            }
        ]
    }, {
        "id": 2,
        "children": [{
                "id": 3
            }, {
                "id": 12
            }
        ]
    }, {
        "id": 13
    }
]

function parse_tree_2(n) {
    return(_und.map(n, parse_tree));
}

function parse_tree(n) {
    if (n['children']) {
        return({id: n['id'], children: parse_tree_2(n['children'])});
    } else {
        return({id: n['id']});
    }
}

result = _und.map(data, parse_tree);

console.log("Result: %j", result);

您可以将其放入文件中,然后使用节点执行(使用 nmp安装节点下载下划线)。

在简单的js上它会是这样的:

<script type="text/javascript" src="http://underscorejs.org/underscore-min.js"></script>
<script type="text/javascript">

data = [{
        "id": 1,
        "children": [{
                "id": 7,
                "children": [{
                        "id": 8,
                        "children": [{
                                "id": 4
                            }, {
                                "id": 5
                            }, {
                                "id": 11
                            }
                        ]
                    }, {
                        "id": 9
                    }
                ]
            }, {
                "id": 6
            }, {
                "id": 10
            }
        ]
    }, {
        "id": 2,
        "children": [{
                "id": 3
            }, {
                "id": 12
            }
        ]
    }, {
        "id": 13
    }
]

function parse_tree_2(n) {
    return(_.map(n, parse_tree));
}

function parse_tree(n) {
    if (n['children']) {
        return({id: n['id'], children: parse_tree_2(n['children'])});
    } else {
        return({id: n['id']});
    }
}

result = _.map(data, parse_tree);

console.log("Result: %j", result);

</script>

Ruby代码:

require 'json'

data = <<EOF
[{
        "id": 1,
        "children": [{
                "id": 7,
                "children": [{
                        "id": 8,
                        "children": [{
                                "id": 4
                            }, {
                                "id": 5
                            }, {
                                "id": 11
                            }
                        ]
                    }, {
                        "id": 9
                    }
                ]
            }, {
                "id": 6
            }, {
                "id": 10
            }
        ]
    }, {
        "id": 2,
        "children": [{
                "id": 3
            }, {
                "id": 12
            }
        ]
    }, {
        "id": 13
    }
]
EOF

json = JSON.parse(data)

def parse_tree(n)
  if n["children"]
    {id: n["id"], children: n['children'].map {|c| parse_tree(c)} }
  else
    {id: n["id"]}
  end
end


result = json.map {|n| parse_tree(n) }

puts result