How to update the existing list value for specific key in NodeJS-CodePudding

I've wanted to update the specific key's value dynamically in NodeJS. Initially, this key USER_SAL has the value of 0, I would like to update this key USER_SAL value dynamically from USER_SAL -> 0 To USER_SAL -> 50000. Please find my code below:

const obj = {
    users: [{
        name: "USER_ID",
        value: "ASD32343D",
      },
      {
        name: "USER_NAME",
        value: "mark",
      },
      {
        name: "USER_ALT_ID",
        value: "DSDF3234",
      },
      {
        name: "USER_LOC",
        value: "NY",
      },
      {
        name: "USER_SAL",
        value: "0",
      },
    ],
  };
  const changes = {
    USER_ALT_ID: "myuser.altID", // changing to different key name
    USER_LOC: "myuser.loc", // changing to different key name
  };
  
  obj.users.forEach((o) => {
    if (changes[o.name]) o.name = changes[o.name];
  });
  
  console.log(obj.users);

Expected output:

[
  { name: 'USER_ID', value: 'ASD32343D' },
  { name: 'USER_NAME', value: 'mark' },
  { name: 'myuser.altID', value: 'DSDF3234' },
  { name: 'myuser.loc', value: 'NY' },
  { name: 'USER_SAL', value: '50000' }
]

I'm not very good at NodesJS, can someone please help how can we update the specific key's value. Appreciate your help in advance. Thanks!

CodePudding user response：

Use map instead of forEach, map allows you to create a new array based on changes to an old one. See below:

const obj = {
    users: [{
        name: "USER_ID",
        value: "ASD32343D",
      },
      {
        name: "USER_NAME",
        value: "mark",
      },
      {
        name: "USER_ALT_ID",
        value: "DSDF3234",
      },
      {
        name: "USER_LOC",
        value: "NY",
      },
      {
        name: "USER_SAL",
        value: "0",
      },
    ],
  };
  const changes = {
    USER_ALT_ID: "myuser.altID", // changing to different key name
    USER_LOC: "myuser.loc", // changing to different key name
  };
  
  const newUsers = obj.users.map((o) => {
    if (changes[o.name]) o.name = changes[o.name];
    if(o.name === "USER_SAL") o.value = "50000";
    return o;
  });
  
  obj.users = newUsers;
  
  console.log(obj.users);

CodePudding user response：

const obj = {
    users: [{
        name: "USER_ID",
        value: "ASD32343D",
      },
      {
        name: "USER_NAME",
        value: "mark",
      },
      {
        name: "USER_ALT_ID",
        value: "DSDF3234",
      },
      {
        name: "USER_LOC",
        value: "NY",
      },
      {
        name: "USER_SAL",
        value: "0",
      },
    ],
  };
  const keyChanges = {
    USER_ALT_ID: "myuser.altID", // changing to different key name
    USER_LOC: "myuser.loc", // changing to different key name
  };
  const valueChanges = {
    USER_SAL: 5000,
  };

  obj.users = obj.users.map(x=>({ 
    name: keyChanges[x.name] || x.name,
    value: valueChanges[x.name] || x.value, 
  }));
  
  console.log(obj.users);

CodePudding user response：

I created a function that would change that value to whatever you wanted:

const dynSal = (arr, dynVal) => {
  for (let i = 0; i < arr.length; i  ) {
    if (arr[i].name === "USER_SAL") {
      arr[i].value = dynVal;
    }
  }
}

dynSal(obj.users, 5000);

You provide the function with the array of objects. It loops through those objects and changes the value if it happens up an object for which the name is "USER_SAL" JP