How to create javascript array and save another array data to created array in Javascript

Question

create a javascript array and save another array of data to created an array in Javascript. I have tried it in the following mentioned way.

Code:

var vvv=this.new_products.length-this.quote.lines.length;
      let mmm={};
      if(vvv > 0){
        for(var i = 0; i <= vvv-1; i++){
          mmm ={...this.new_products[this.quote.lines.length+i]};
        }
      }
      console.log(mmm);

example:

this.new_products -> 
    0: {…}
    1: {…}
    2: {…}
    3: {…}
this.quote.lines ->
    0: {…}
    1: {…}

The output should be ->

mmm->
    0: {…} (this.new_products[2])
    1: {…} (this.new_products[3])

Current output->

{product_code: "khdbdvdjlhc de", description: "sscs", note: "csccc", pinned: false, third_party: 0, …}

My tried code is not working. Please help me to solve this.

It's not clear what you want. Give an exemple of input and what would be the desired result for that input. — Pedro Lima
– Pedro Lima, Commented Oct 15, 2020 at 13:53
console.log(mmm); this is undefined, mmm is out of the block where it was declared — lissettdm
– lissettdm, Commented Oct 15, 2020 at 13:59

lissettdm · Accepted Answer · 2020-10-15 14:48:07Z

2

I assumed that you need the remains items:

 let m = [];
 for(var i = 0; i <= vvv - 1; i++){
    m.push({...this.new_products[this.quote.lines.length+i]});
 }

edited Oct 15, 2020 at 14:48

answered Oct 15, 2020 at 14:07

lissettdm

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5 Comments

user_v12 Over a year ago

I edited my tried code with your answer. But I am getting a new error now. > Error in v-on handler: "TypeError: Assignment to constant variable."

lissettdm Over a year ago

Yes, replace const mmm={}; for let mmm={};

user_v12 Over a year ago

Now it workes. But now there is another problem. The problem is now always saving inside mmm the last one. If there are 2 changes this adds only the last change. not both changes. How Can I solve this?

lissettdm Over a year ago

Can you add an example with the problem you are facing?

lissettdm Over a year ago

@user_v12 I updated my answer, I assumed that m is type of Array

Nick · Accepted Answer · 2020-10-15 14:10:12Z

0

You can create a shallow copy by using the ... spread operator like this:

var array = ["thing1", "thing2"];

var array2 = [...array];

If you need to make a deep copy, one of the easiest method is using lodash's cloneDeep() function like this:

import _ from 'lodash';

var array = ["thing1", "thing2"];

var array2 = _.cloneDeep(array);

answered Oct 15, 2020 at 14:10

Nick

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