Set value of a key in an array of objects in ES6?

Question

Is there a way in ES6, to set value of a key in all objects, in an array of objects to a new value.

[
    {title: 'my title', published: false},
    {title: 'news', published: true}, 
    ...
]

For example, setting every item published value to true ?

Answer 1

The array in your example is just a one-dimensional array of objects.

You can do what you asked with forEach and a lambda:

array.forEach(element => element.published = true);

Answer 2

Use map

arr = arr.map( s => (s.published = true, s) );

Edit

No need to set the return value either, just

arr.map( s => (s.published = true, s) );

would suffice

Demo

 var arr = [{ title: 'my title', published: false }, { title: 'news', published: true } ]; arr.map(s => (s.published = true, s)); console.log(arr); 

Answer 3

I'd use a loop.

arr represents your array of objects

var result = []
for (var i = 0; i < arr.length; i++) {
  result.push([arr[i].title, arr[i].published])
}
console.log(result)

this will result in [['my Title', false], ['news', true]]

Answer 4

If you don't want a loop you can refer with index.

    a = [
        {title: 'my title', published: false},
        {title: 'news', published: true}
        ]

a[0].published= true;
a[1].published= true;

or loop it

        for (val in a) {
            a[val].published = true;
        }

Answer 5

您可以将map功能与点差运算符一起使用

let array = [ { title: 'my title', published: false }, { title: 'news', published: true } ]

array = array.map(t => t.published !== true ? { ...t, published: true } : t)