How to set specific property value of all objects in a javascript object array (lodash)

Question

I have following object array:

var arr = [
  {
    id    : "a1",
    guid  : "sdfsfd",
    ...
    value : "abc",
    status: "active"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",
    ...
    value : "def",
    status: "inactive"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",
    ...
    value : "def"
  },
  ...
]

How to set "status" property of each object to "active". So the resulting array will be:

var arr = [
  {
    id    : "a1",
    guid  : "sdfsfd",
    ...
    value : "abc",
    status: "active"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",
    ...
    value : "def",
    status: "active"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",
    ...
    value : "def",
    status: "active"
  },
  ...
]

Additionally this should create the property "active" if doesn't exists.

I can do this using for loops. But I'm pretty much sure lodash can do this in one line like:

arr = _.set_property(arr, "status", "active");

Answer 1

You don't need lodash for this.

---

The first object is missing your status property and it will be added.

SHOWING THREE WAYS HOW YOU CAN DO IT

IMMUTABLE VERSION (We create a new array using map)

const arrImmutableVersion = arr.map(e => ({...e, status: "active"}));

MUTABLE VERSIONS (We change the original array)

arr.forEach((el)=>{el.status = "active";}) 

or

arr.forEach(function(el){el.status = "active";}) 

var arr = [
  {
    id    : "a1",
    guid  : "sdfsfd",   
    value : "abc"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",   
    value : "def",
    status: "inactive"
  },
  {
    id    : "a2",
    guid  : "sdfsfd",   
    value : "def",
    status: "active"
  } 
];

// SHOWING THREE WAYS HOW YOU CAN DO IT

// MUTABLE VERSIONS - We change the original array
arr.forEach((el)=>{el.status = "active";}) // ES6
// or
arr.forEach(function(el){el.status = "active";}) 
//or
// IMMUTABLE VERSION - We create a new array using `map`
const arrImmutableVersion = arr.map(e => ({...e, status: "active"})); // ES6
//--------------------------------------------------------------


// RESULTS:
console.log("logging results of object 'arr'");
console.log(arr);
console.log("---------------------------------------------------------");
console.log("logging results of object 'arrImmutableVersion'");
console.log(arrImmutableVersion);