Function for multiple items

Questions
1

Hi everyone,

I can’t figure out how to run a Function on multiple items.
I’m looping through items[0].json, however there is an items[1].json, items[2].json, etc, and I’m not sure what to do other than copy the same Function multiple times. (Which is not a good solution, as the number of items might change.

If I map the items into one item, that just causes more headache later in the workflow as I can’ figure otu how to get all of the data out of it as needed, so I would prefer to take care of the problem here.

Thanks for any help

(part of) my workflow, with some mock data:

2

Welcome to the community @telos

Change the function node to the code below. That should do it.

const results = []

for (const item of items) {
  for (const token of item.json.tokens) {
    results.push({ json: token })
  }
}

return results;
3

I just knew that the answer will be making me feel stupid for overlooking it.
I was half right. I actually previously tried using the same code you suggested, however it didn’t work (ERROR: item.json.tokens is not iterable - and really didn’t understand why so I moved on).

But now that I tried it with my example workflow, it worked flawlessly so I looked into it, and manage to figure out the reason: one of the addresses I query (that it not in the example that I provided) doesn’t have a “tokens” object.

Now I just have to figure out how to exclude responses that has no tokens object. Probably an IF node, but I leave it for tomorrow.

Thank you very much for the help and the welcome.

4

You can add an if before the loop. Check the example below.

const results = []

for (const item of items) {
  if (item.json.hasOwnProperty('tokens')) {
      for (const token of item.json.tokens) {
      results.push({ json: token })
    }
  }
}

return results;
5

Thanks again.
I was trying to avoid turning this into a javascript helpdesk, but one additional question.

I need to add the ETH address value to every one of the tokenInfo strings, but just can’t figure out how.
Every item has a different ETH address to add.

So I’m looking from this:

 [
{
"address": "0x85c472b13c20460d44aec35346f3441959f6dd33",
"ETH": {
"price": {
"rate": 3195.1098860615193,
"diff": -6.87,
"diff7d": -19.16,
"ts": 1631531762,
"marketCapUsd": 375442502251.81396,
"availableSupply": 117505348.999,
"volume24h": 17305270902.642925,
"diff30d": -3.005162245409764,
"volDiff1": -2.727215391286208,
"volDiff7": 8.460140704535405,
"volDiff30": 0.7670256816714414
},
"balance": 7.214738026712414,
"rawBalance": "7214738026712414138"
},
"countTxs": 316,
"tokens": [
{
"tokenInfo": {
"address": "0x0e49144b8b8d228eb7d266f15b2e140fea72a54e",
"decimals": "0",
"name": "Abstract Store",
"owner": "0x",
"symbol": "DAVIS",
"totalSupply": "100",
"lastUpdated": 1628121185,
"issuancesCount": 0,
"holdersCount": 1,
"ethTransfersCount": 0,
"price": false
},
"balance": 1,
"totalIn": 0,
"totalOut": 0,
"rawBalance": "1"
},

To this, for every single one of the tokenInfo strings in the item(s):

 [
{
"address": "0x85c472b13c20460d44aec35346f3441959f6dd33",
"ETH": {
"price": {
"rate": 3195.1098860615193,
"diff": -6.87,
"diff7d": -19.16,
"ts": 1631531762,
"marketCapUsd": 375442502251.81396,
"availableSupply": 117505348.999,
"volume24h": 17305270902.642925,
"diff30d": -3.005162245409764,
"volDiff1": -2.727215391286208,
"volDiff7": 8.460140704535405,
"volDiff30": 0.7670256816714414
},
"balance": 7.214738026712414,
"rawBalance": "7214738026712414138"
},
"countTxs": 316,
"tokens": [
{
"tokenInfo": {
"ETHaddress": "0x85c472b13c20460d44aec35346f3441959f6dd33",
"address": "0x0e49144b8b8d228eb7d266f15b2e140fea72a54e",
"decimals": "0",
"name": "Abstract Store",
"owner": "0x",
"symbol": "DAVIS",
"totalSupply": "100",
"lastUpdated": 1628121185,
"issuancesCount": 0,
"holdersCount": 1,
"ethTransfersCount": 0,
"price": false
},
"balance": 1,
"totalIn": 0,
"totalOut": 0,
"rawBalance": "1"
},
6

Hey @telos,

I’ve modified the solution that Ricardo provided. This new solution will add the ETH address to the tokenInfo object.

const results = []

for (const item of items) {
  if (item.json.hasOwnProperty('tokens')) {
      for (const token of item.json.tokens) {
      const ETHaddress = {ETHaddress:item.json.address};
      Object.assign(token.tokenInfo, ETHaddress);
      results.push({ json: token })
    }
  }
}

return results;
7

Hey, @harshil1712

Looks good, thank you.