how to split an array into two arrays in javascript?

Question

I have an array var plans=[a, b, c, d ]; with prices based monthly any yearly.

Consider- a and b are monthly and c and d are yearly.

So, I want to split the array based on the monthly and yearly values and store the values in to separate arrays

var monthly_plans=[]; and  var yearly_plans=[]

So, how do I do this?

I have used the js split() function before but on a very basic level.

Solution 1

I think it will be a better avenue to use a for.

Example:

for (var i=0;i<plans.length;i++)
{
  if(plans[i] == 'monthly condition')
  {
     monthly_plans.push(plans[i]);
  }
  else
  {
     yearly_plans.push(plans[i]);
  }
}

Solution 2

You can use the slice(start, end) function on arrays, e.g.

monthly_plans = plans.slice(0,2);
yearly_plans = plans.slice(2,4);

More info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice

Solution 3

split() is a method of the String object, not of the Array object.

From what I understand from your question, you need the Array.prototype.slice() method instead:

The slice() method returns a shallow copy of a portion of an array into a new array object.

Syntax

arr.slice([begin[, end]])

In conclusion, you may want to do something like this:

var monthly_plans = plans.slice(0, 2);
var yearly_plans = plans.slice(2);

Solution 4

And the ES5 approach:

var plans=[a, b, c, d];

var monthly_plans = plans.filter( plan => plan==='monthly condition' );
var yearly_plans = plans.filter( plan => plan==='yearly condition' );

Solution 5

Based on your post, the solution will not involve split(). If you know in advance which plan designations are monthly and which are yearly:

var plans = ['a', 'b', 'c', 'd', 'm', 'y', ....... 'n'],
    count = plans.length, i = 0;

var monthly_designations = ['a', 'b', 'm'],
    yearly_designations = ['c', 'd', 'y'];

for(; i < count; i++) {

    if (monthly_designations.indexOf(plans[i]) !== -1) {
        monthly_plans.push(plans[i]);
    } else {
        if (yearly_designations.indexOf(plans[i]) !== -1) {
            yearly_plans.push(plans[i]);
        }
    }

}

Then just check the plans array against the known designations to filter the contents into the correct sub-arrays monthly_plans and yearly_plans.

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Comments

[The One and Only ChemistryBlob]

This works but is not a general solution. Surely the OP's actual array is not only [a, b, c, d]

[Nauman Tanwir]

thanks for replying. what is monthly condition in your loop? I mean what is it doing ?

[Michael]

You have to replace it by the condition you want to consider that the value is for monthly plans.

[Nauman Tanwir]

so as in my case irs ' "cpinterval": "Monthly" ' so, it would be like plans[i].cpinterval == 'Monthly'

[Michael]

exactly, so you will be able to create your arrays even if the data is not in the correct order

[Barmar]

i <= plans.length should be i < plans.length