Modify object property in an array of objects

Question

var foo = [{ bar: 1, baz: [1,2,3] }, { bar: 2, baz: [4,5,6] }];

var filtered = $.grep(foo, function(v){
    return v.bar === 1;
});

console.log(filtered);
<         


        

Answer 1

You can make use of filter function of javascript.

obj = [
    {inActive:false, id:1},
    {inActive:false, id:2},
    {inActive:false, id: 3}
];
let nObj = obj.filter(ele => {
    ele.inActive = true;
    return ele;
});

console.log(nObj);

Answer 2

Without jQuery and backwards compatibility

for (var i = 0; i < foo.length; i++) {
    if (foo[i].bar === 1) {
        foo[i].baz = [11,12,13];
    }
}

Answer 3

$.each(foo,function(index,value)
{
    if(this.bar==1)
    {
this.baz[0] = 11;
        this.baz[1] = 22;
        this.baz[2] = 33;
    }

});

but for loop is faster than $.each so u can try to use

for(var i=0; i <foo.length; i++)
{

if(foo[i].bar==1)
{
//change the code
}
}

Answer 4

You can use find and change its property.

let foo = [{ bar: 1, baz: [1,2,3] }, { bar: 2, baz: [4,5,6] }];

let obj = foo.find(f=>f.bar==1);
if(obj)
  obj.baz=[2,3,4];
console.log(foo);

Answer 5

We can also achieve this by using Array's map function:

 foo.map((obj) => {
   if(obj.bar == 1){
     obj.baz[0] = 11;
     obj.baz[1] = 22;
     obj.baz[2] = 33;
   }
 })

Answer 6

you can play around:

const tasks = [ { id: 1, done: false }, { id: 2, done: false } ]
const completed_task = { id: 1, done: true }

const markCompleted = (tasks, task) => {
  const index = tasks.findIndex(t => t.id === task.id);
  tasks.splice(index, 1);
  tasks.push(task);
  return tasks;
}

console.log(tasks)
console.log(markCompleted(tasks, completed_task))

EDIT

to avoid index change:

const markCompleted = (tasks, task) => {
      const index = tasks.findIndex(t => t.id === task.id);
      tasks[index] = task;
      return tasks;
    }