如何替换 JSON 对象数组中某个键的所有值

Question

I have an array of JSON object, for example, people with data, for example:

[
  {
    name : 'John',
    age : '7'
  },
  {
    name : 'Mary',
    age : '70'
  },
  {
    name : 'Joe',
    age : '40'
  },
  {
    name : 'Jenny',
    age : '4'
  }
]

I want to substitute all string values in age for its corresponding integer in order to sort by age . Or to add a key, for example ageI with the integer value.

I could loop through the array, but, is there a better way to do that, for example with one command in jQuery?

Answer 1

You can use forEach to modify the array in place:

 var array = [ { name : 'John', age : '7' }, { name : 'Mary', age : '70' }, { name : 'Joe', age : '40' }, { name : 'Jenny', age : '4' } ] array.forEach(obj => { obj.age = Number(obj.age) }); console.log(array);

Or use map to make a new array:

 var array = [ { name : 'John', age : '7' }, { name : 'Mary', age : '70' }, { name : 'Joe', age : '40' }, { name : 'Jenny', age : '4' } ] console.log( array.map(obj => ({ name: obj.name, age: Number(obj.age) })) );

Answer 2

If you just want to sort, simply sort with a callback

arr.sort((a,b) => parseInt(a.age, 10) - parseInt(b.age, 10));

If you want the values to stay ints, use a simple loop

arr.forEach(e => e.age = parseInt(e.age, 10));