map an array from an array of objects key/value

Question

I need to take an array objects that and map it so that the new array is just a simple array if each object's id.

So for example:

[
    {id: 49, name: "Rest update test"},
    {id: 12, name: "Rest test"}
]

would become:

[49, 12]

i have tried this so far:

myObject.map(object => object.id);

so my actual function that is not working is the following, when I view the console.log, it is showing the original object:

onSubmit() {
    this.userForm.value.accountsToAdd.map(object => object.id);
    console.log(this.userForm.value.accountsToAdd);
}

Could it be that you're missing a comma in your array definition? That map statement works fine as long as the map function is supported. In older browsers you need to use a for loop — 3ocene
– 3ocene, Commented Mar 15, 2018 at 19:52
not the comma, sorry that is just a copy and past out of the console.log I forgot the comma in the post — Sandra Willford
– Sandra Willford, Commented Mar 15, 2018 at 19:54

Nina Scholz · Accepted Answer · 2018-03-15 20:12:05Z

5

Assuming the given code does not work, then you need to assign the result of mapping.

Array#map does not mutate the original array but return a new one.

var array = [{ id: 49, name: "Rest update test" }, { id: 12, name: "Rest test" }],
    ids = array.map(object => object.id);

console.log(ids);

edited Mar 15, 2018 at 20:12

answered Mar 15, 2018 at 19:52

Nina Scholz

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2 Comments

Sandra Willford Over a year ago

I added the function I am calling this in, as you can see. so do i need to reassign this.userForm.value.accountsToAdd to a variable within the function scope first?

Nina Scholz Over a year ago

map returns a new array and you need to assign it somwhere.

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