javascript - Lodash 查找并显示当前的 json 数据

Question

在下面的代码中，“answer”键出现在第二个和第四个对象中，但是当我运行代码时，我只得到第二个对象作为输出。

预期输出是需要显示“答案”的对象

    var users = [{
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "01"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "aaa",
  "answer": "02"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "03"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "aaa",
  "answer": "04"
}];

function checkAnsExist(){
    var forEach = _.find(users, _.forEach(function(i){ return i.answer}));
    document.write(JSON.stringify(forEach));
}
checkAnsExist();

<script src="https://cdn.jsdelivr.net/lodash/4.17.4/lodash.core.min.js"></script>

Answer 1

您正在寻找的是filter ，而不是查找

    var users = [{
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "01"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "aaa",
  "answer": "02"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "03"
}, {
	"answerLength": "10",
	"isComment": "false",
	"question": "what?",
	"uniqueId": "aaa",
  "answer": "04"
}];

function checkAnsExist(){
    var forEach = _.filter(users, 'answer');
    document.write(JSON.stringify(forEach));
}
checkAnsExist();

<script src="https://cdn.jsdelivr.net/lodash/4.17.4/lodash.core.min.js"></script>