Javascript:如何匹配数组和json？

Question

如何找到数组和 json 之间的匹配项？

var fields = [ { public_name: 'hello', code_name: 'world' },
  { public_name: 'particles', code_name: 'pm2.5' },
  { public_name: 'humidity', code_name: 'hum' } ]

var species = [{"code_name":"hum","public_name":"humidity"},
  {"code_name":"pm2.5","public_name":"particles"},
  {"code_name":"world","public_name":"hello"}]


fields.forEach(function(field, index) {       
    if (field.code_name === species.code_name) {
        console.log('match:' + code_name)
    }
});

结果应该是:

match: world
match: pm2.5
match: hum

有什么想法吗？

Answer 1

您可以使用哈希表进行查找。

var fields = [{ public_name: 'hello', code_name: 'world' }, { public_name: 'particles', code_name: 'pm2.5' }, { public_name: 'humidity', code_name: 'hum' }],
    species = [{ "code_name": "hum", "public_name": "humidity" }, { "code_name": "pm2.5", "public_name": "particles" }, { "code_name": "world", "public_name": "hello" }],
    match,
    hash = Object.create(null),
    getHashKey = function (o) { return o.public_name + '|' + o.code_name; };

fields.forEach(function (a) {
    hash[getHashKey(a)] = true;
});

match = fields.filter(function (a) {
    return hash[getHashKey(a)];
});

console.log(match);