Is it possible to iterate over the array, excluding the first element?

Question

Is it possible to iterate over the array, excluding the first element (omit the first object in the array)?

CODE:

 let multipleDemo =[];

 let people = [
    { name: 'Adam',      email: '[email protected]',      age: 12, 
country: 'United States' },
    { name: 'Amalie',    email: '[email protected]',    age: 12, 
country: 'Argentina' },
    { name: 'Estefanía', email: '[email protected]', age: 21, 
country: 'Argentina' },
    { name: 'Adrian',    email: '[email protected]',    age: 21, 
country: 'Ecuador' },
    { name: 'Wladimir',  email: '[email protected]',  age: 30, 
country: 'Ecuador' },
    { name: 'Samantha',  email: '[email protected]',  age: 30, 
country: 'United States' },
    { name: 'Nicole',    email: '[email protected]',    age: 43, 
country: 'Colombia' },
    { name: 'Natasha',   email: '[email protected]',   age: 54, 
country: 'Ecuador' },
   { name: 'Michael',   email: '[email protected]',   age: 15, 
country: 'Colombia' },
   { name: 'Nicolás',   email: '[email protected]',    age: 43, 
country: 'Colombia' }
  ];

for(var i =0; i < people.length; i++) {
     multipleDemo.push(people[i]);
     people.splice(people[i], 1000);
     console.log(multipleDemo);
     console.log(people);
}

Example code: https://plnkr.co/edit/UJfRUs6dAT1NC1EnOvqA?p=preview

I want to leave { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' } in array people. Rest of elements I want to put in array multipleDemo

I want such as FINISH EFFECT:

 let multipleDemo =[,
    { name: 'Amalie',    email: '[email protected]',    age: 12, 
country: 'Argentina' },
    { name: 'Estefanía', email: '[email protected]', age: 21, 
country: 'Argentina' },
    { name: 'Adrian',    email: '[email protected]',    age: 21, 
country: 'Ecuador' },
    { name: 'Wladimir',  email: '[email protected]',  age: 30, 
country: 'Ecuador' },
    { name: 'Samantha',  email: '[email protected]',  age: 30, 
country: 'United States' },
    { name: 'Nicole',    email: '[email protected]',    age: 43, 
country: 'Colombia' },
    { name: 'Natasha',   email: '[email protected]',   age: 54, 
country: 'Ecuador' },
   { name: 'Michael',   email: '[email protected]',   age: 15, 
country: 'Colombia' },
   { name: 'Nicolás',   email: '[email protected]',    age: 43, 
country: 'Colombia' }];

 let people = [
    { name: 'Adam',      email: '[email protected]',      age: 12, 
country: 'United States' }
  ];

Why not start with for(var i =1; i < people.length; i++) { in your loop? — Mark
– Mark, Commented Apr 17, 2019 at 7:30
you could slice the array, like here: stackoverflow.com/q/42374873/1447675 — Nina Scholz
– Nina Scholz, Commented Apr 17, 2019 at 7:30
I want to leave { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' } in array people. Rest of elements I want to put in array multipleDemo — user8777652
– user8777652, Commented Apr 17, 2019 at 7:38

CodeF0x · Accepted Answer · 2019-04-17 08:04:15Z

4

You can use Array.prototype.slice() to modify your arrays to get your desired output.

let people = [{
    name: 'Adam',
    email: '[email protected]',
    age: 12,
    country: 'United States'
  },
  {
    name: 'Amalie',
    email: '[email protected]',
    age: 12,
    country: 'Argentina'
  },
  {
    name: 'Estefanía',
    email: '[email protected]',
    age: 21,
    country: 'Argentina'
  },
  {
    name: 'Adrian',
    email: '[email protected]',
    age: 21,
    country: 'Ecuador'
  },
  {
    name: 'Wladimir',
    email: '[email protected]',
    age: 30,
    country: 'Ecuador'
  },
  {
    name: 'Samantha',
    email: '[email protected]',
    age: 30,
    country: 'United States'
  },
  {
    name: 'Nicole',
    email: '[email protected]',
    age: 43,
    country: 'Colombia'
  },
  {
    name: 'Natasha',
    email: '[email protected]',
    age: 54,
    country: 'Ecuador'
  },
  {
    name: 'Michael',
    email: '[email protected]',
    age: 15,
    country: 'Colombia'
  },
  {
    name: 'Nicolás',
    email: '[email protected]',
    age: 43,
    country: 'Colombia'
  }
];

let multipleDemo = people.slice(1); 
people = people.slice(0, 1);
console.log(multipleDemo);
console.log('--------------------');
console.log(people);

edited Apr 17, 2019 at 8:04

answered Apr 17, 2019 at 7:31

CodeF0x

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2 Comments

user8777652 Over a year ago

I want to leave { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' } in array people. Rest of elements I want to put in array multipleDemo

CodeF0x Over a year ago

@Mario Should meet your requirements now.

Mohammad Usman · Accepted Answer · 2019-04-17 07:40:34Z

2

You can use Array Destructuring to unpack and assign remaining part of the array to a variable using rest pattern and use .forEach() to iterate over them as follows:

const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const [first, ...rest] = arr;

rest.forEach(v => console.log(v));

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Apr 17, 2019 at 7:40

Mohammad Usman

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Comments

Zainul Abideen · Accepted Answer · 2019-04-17 08:02:39Z

0

There are many ways to achieve this. but the easiest and concise solution would be using the filter(). Which returns an array that contains each element where the condition is met.

 let people = [
    { name: 'Adam',      email: '[email protected]',      age: 12, 
country: 'United States' },
    { name: 'Amalie',    email: '[email protected]',    age: 12, 
country: 'Argentina' },
    { name: 'Estefanía', email: '[email protected]', age: 21, 
country: 'Argentina' },
    { name: 'Adrian',    email: '[email protected]',    age: 21, 
country: 'Ecuador' },
    { name: 'Wladimir',  email: '[email protected]',  age: 30, 
country: 'Ecuador' },
    { name: 'Samantha',  email: '[email protected]',  age: 30, 
country: 'United States' },
    { name: 'Nicole',    email: '[email protected]',    age: 43, 
country: 'Colombia' },
    { name: 'Natasha',   email: '[email protected]',   age: 54, 
country: 'Ecuador' },
   { name: 'Michael',   email: '[email protected]',   age: 15, 
country: 'Colombia' },
   { name: 'Nicolás',   email: '[email protected]',    age: 43, 
country: 'Colombia' }
  ];

let multipleDemo = people.filter((v, k) => k !== 0);
people = people.filter((v, k) => k === 0);

console.log(multipleDemo)
console.log(people)

edited Apr 17, 2019 at 8:02

answered Apr 17, 2019 at 7:37

Zainul Abideen

1,90022 silver badges39 bronze badges

7 Comments

user8777652 Over a year ago

I want to leave only { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' } in people array

Zainul Abideen Over a year ago

the new array that is been created called multipleDemo doesn't have { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' }. I think this is what you wanted. Check the multipleDemo again

user8777652 Over a year ago

people array must to have only one element { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' }

Zainul Abideen Over a year ago

okay!. So you only want { name: 'Adam', email: '[email protected]', age: 12, country: 'United States' } to be in the array. rest of the elements you don't want. right?

user8777652 Over a year ago

Updated my question. Rest of the elements put in multipleDemo array

|

josephting · Accepted Answer · 2019-04-17 07:46:01Z

You can use .slice() to omit n elements from the beginning.

Array.slice(1) means you take the array starting from index 1 to the end.

You can also define until which element you want to slice off.

Array.slice(1, 3) will slice the elements of index 1 and 2. It will be Amalie and Estefanía in this case.

let people = [
  { name: "Adam", email: "[email protected]", age: 12, country: "United States" },
  { name: "Amalie", email: "[email protected]", age: 12, country: "Argentina" },
  { name: "Estefanía", email: "[email protected]", age: 21, country: "Argentina" },
  { name: "Adrian", email: "[email protected]", age: 21, country: "Ecuador" },
  { name: "Wladimir", email: "[email protected]", age: 30, country: "Ecuador" },
  { name: "Samantha", email: "[email protected]", age: 30, country: "United States" },
  { name: "Nicole", email: "[email protected]", age: 43, country: "Colombia" },
  { name: "Natasha", email: "[email protected]", age: 54, country: "Ecuador" },
  { name: "Michael", email: "[email protected]", age: 15, country: "Colombia" },
  { name: "Nicolás", email: "[email protected]", age: 43, country: "Colombia" }
];

let multipleDemo = people.slice(1);

multipleDemo.forEach(function (current) {
  console.log(current.name);
});

Sparsh · Accepted Answer · 2019-04-17 07:53:39Z

0

Since you simply want to copy the elements from people array to multipleDemo array excluding the first element, you could use slice() array method.

multipleDemo = people.slice(1)

.slice(1) will copy the contents of people array from index1 without reference to the multipleDemo array.
.slice() in MDN

answered Apr 17, 2019 at 7:53

Sparsh

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