如何在json数组中保留特定元素并删除其他元素？

Question

I have following json array:

[
 { "id": "1", "title": "Pharmacy", "desc": "xyz"},
 { "id": "21", "title": "Engineering", "desc": "xyz"},
 { "id": "30", "title": "Agriculture", "desc": "xyz"},
 ...
]

I want to keep only title element and remove other. I tried to solve this using php and javascript.

Answer 1

var arr = [
 { "id": "1", "title": "Pharmacy", "desc": "xyz"},
 { "id": "21", "title": "Engineering", "desc": "xyz"},
 { "id": "30", "title": "Agriculture", "desc": "xyz"}
];

arr.forEach(function(obj) {
  delete obj.id;
  delete obj.desc;
});

console.log(arr);

Or if you want to get an array of titles and keep the original array intact:

var arr = [
 { "id": "1", "title": "Pharmacy", "desc": "xyz"},
 { "id": "21", "title": "Engineering", "desc": "xyz"},
 { "id": "30", "title": "Agriculture", "desc": "xyz"}
];

var titles = arr.map(function(obj) {
  return obj.title;
});

console.log(titles);

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