Iterative function to intercept values by key-CodePudding

I have a big JSON file that I want to intercept all the values that have the key text associated with them, for example:

    type":"doc",
   "content":[
      {
         "type":"paragraph",
         "content":[
            {
               "text":"this is a simple page, about a simple umbrella.",
               "type":"text"
            }
         ]
      },
      {
         "type":"paragraph",
         "content":[
            {
               "text":"you can use this text to find the umbrella page.",
               "type":"text"
            }
         ]
      },
      {
         "type":"paragraph",
         "content":[
            {
               "text":"do you like it?",
               "type":"text"
            }
         ]
      },

I know I can use Object.keys but that only covers the "top level" and doesn't go deeper.

I don't wish to use recursion for this, but use an iterative function.

I tried to use JSON.stringify but it has poor performance:

const obj = JSON.parse(content);
let ret = '';
JSON.stringify(obj, (_, nested) => {
  if (nested && nested[key]) {
    ret  = nested[key]   '\n';
  }
  return nested;
});

CodePudding user response：

Not shure that I catch the question, but here is lodash solution:

const _ = require('lodash');

const data = '{"type":"doc","content":[{"type":"paragraph","content":[{"text":"this is a simple page, about a simple umbrella.","type":"text"}]},{"type":"paragraph","content":[{"text":"you can use this text to find the umbrella page.","type":"text"}]},{"type":"paragraph","content":[{"text":"do you like it?","type":"text"}]}]}';

const obj = JSON.parse(data);

const newObj = _.cloneDeepWith(obj, (val, key) => {
  if (key === 'text') return `${val.toUpperCase()}`;
});

console.dir(newObj, {depth : null});
//   type: 'doc',
//   content: [
//     {
//       type: 'paragraph',
//       content: [
//         {
//           text: 'THIS IS A SIMPLE PAGE, ABOUT A SIMPLE UMBRELLA.',
//           type: 'text'
//         }
//       ]
//     },
//     {
//       type: 'paragraph',
//       content: [
//         {
//           text: 'YOU CAN USE THIS TEXT TO FIND THE UMBRELLA PAGE.',
//           type: 'text'
//         }
//       ]
//     },
//     {
//       type: 'paragraph',
//       content: [ { text: 'DO YOU LIKE IT?', type: 'text' } ]
//     }
//   ]
// }

CodePudding user response：

If your goal is to just get the key text, you can use the following method.

var reg = /(?<=\")\w (?=\"\:)/g
var jsonValue = '{"glossary": {"title": "example glossary","GlossDiv": {"title": "S","GlossList": {"GlossEntry": {"ID": "SGML","SortAs": "SGML","GlossTerm": "Standard Generalized Markup Language","Acronym": "SGML","Abbrev": "ISO 8879:1986","GlossDef": {"para": "A meta-markup language, used to create markup languages such as DocBook.","GlossSeeAlso": ["GML", "XML"]},"GlossSee": "markup"}}}}}';

console.log(jsonValue.match(reg));