Javascript Array add or update

Question

Javascript Array push issue

I have a object:

people: [{name: peter, age: 27, email:'[email protected]'}]

I want to push:

people.push({
        name: 'John',
        age: 13,
        email: '[email protected]'
});
people.push({
        name: 'peter',
        age: 36,
        email: '[email protected]'
});

The finally I want is:

people: [
{name: 'peter', age: 36, email:'[email protected]'},
{name: 'john', age: 13, email:'[email protected]'},
]

I dont have any key but the email is a unique

Everything looks correct, except for trailing comma in the resulting array — Andrei Zhytkevich, Jun 20 '16 at 15:13
So what's the problem? As you have it, and in lieu of anymore information about what your *problem actually is*, you could just do `people = []` before the two `push`es and you'd get the result you wanted. But I suspect that isn't what you are going for. — Matt Burland, Jun 20 '16 at 15:14
This post will help you http://stackoverflow.com/questions/351409/appending-to-array — Tin ilijaš, Jun 20 '16 at 15:15

score 2 · Answer 1 · answered Jun 20 '16 at 15:33

You can also do like this by generating an Array method. It takes two arguments. First one designates the object to push and the second is the unique property to check to replace if a previously inserted item exists.

var people = [{name: 'peter', age: 27, email:'[email protected]'}];
Array.prototype.pushWithReplace = function(o,k){
 var fi = this.findIndex(f => f[k] === o[k]);
 fi != -1 ? this.splice(fi,1,o) : this.push(o);
 return this;
};
people.pushWithReplace({name: 'John', age: 13, email: '[email protected]'}, "email");
people.pushWithReplace({name: 'peter', age: 36, email: '[email protected]'},"email");
console.log(people);

score 1 · Accepted Answer · answered Jun 20 '16 at 15:22

There is no "update" method as is in JavaScript.

What you have to do, is simply looping through your array first to check if the object is already inside.

function AddOrUpdatePeople(people, person){
    for(var i = 0; i< people.length; i++){
        if (people[i].email == person.email){
            people[i].name = person.name;
            people[i].age = person.age;
            return;                          //entry found, let's leave the function now
        }
    }
    people.push(person);                     //entry not found, lets append the person at the end of the array.
}

Javascript Array add or update

2 Answers2