How do I replace any instance of "" with null in an array of JSON strings in typescript?-CodePudding

I have an array of JSON that looks like this:

[
{"test":"a","test1":"1","test2":""},
{"test":"b","test1":"","test2":"hi"}
{"test":"","test1":"3","test2":""}
]

I want it to look like this if there are any JSON strings with "" values

[
{"test":"a","test1":"1","test2":null},
{"test":"b","test1":null,"test2":"hi"}
{"test":null,"test1":"3","test2":null}
]

CodePudding user response：

Loop through the array, then loop through all the properties in each object. Test if the value is an empty string, if so replace it with null.

const data = [
  {"test":"a","test1":"1","test2":""},
  {"test":"b","test1":"","test2":"hi"},
  {"test":"","test1":"3","test2":""}
];

data.forEach(obj => {
  Object.keys(obj).forEach(key => {
    if (obj[key] === "") {
      obj[key] = null;
    }
  });
});

console.log(data);

CodePudding user response：

You can just iterate over the array and then each key of the objects, checking for a blank string. Like this:

let data = [
  {"test":"a","test1":"1","test2":""},
  {"test":"b","test1":"","test2":"hi"},
  {"test":"","test1":"3","test2":""}
]

for (let entry of data) {
  Object.entries(entry).map(obj => {
    if (obj[1] === "") entry[obj[0]] = null;
  });
}

console.log(data)

CodePudding user response：

you need one line of code

data= JSON.parse( JSON.stringify(data).replaceAll("\"\"","null").replaceAll("\"\"","\""));

CodePudding user response：

This solution is as simple as efficient

let data = [
{"test":"a","test1":"1","test2":""},
{"test":"b","test1":"","test2":"hi"},
{"test":"","test1":"3","test2":""}
]

for(let objData of data)
  for(let propr in objData)
    if(objData[propr] === "")
      objData[propr] = null;
      
console.log(data)