SyntaxError Preproccessing JavaScript

[WouterPeeters]

I get "SyntaxError: unterminated statement (line 5)" in a preproccessing JavaScript. I don't get this error in my JS online editor

I'm trying to create a JS that parses IPv6 address in decimal form in the OID of Cisco SNMP to a HEX address.
I was able to make the code work in an online editor but when I copy the code to my template in Zabbix I get the above error
It looks like I'm missing a ; on line 5 but I'm not.


using Template in 6.0

Value:

[{"{#SNMPINDEX}":"32.1.1.1.1.1.1.1.1.1.1.1.1.1.1.16","{#SNMPVALUE}":"65001"},{"{#SNMPINDEX}":"32.1.1.1.1.1.1.1.1.1.1.1.1.1.1.32","{#SNMPVALUE}":"65002"},{"{#SNMPINDEX}":"32.1.1.1.1.1.1.1.1.1.1.1.1.1.1.48","{#SNMPVALUE}":"65003"}]

value = value.slice(1, -1);
value = value.replaceAll("},{", "}£{");
const item = value.split("£");
value = '';
let i = 0;
while (i < item.length) {
    item[i] = item [i].slice(1, -1);
    let part = item[i].split(",");
    let j = 0;
    while (j < part.length) {
        let result = part[j].split(":");
        if ((j % 2) == 0) {
            let k = 0;
            let hex = "";
            while (k < result.length) {
                if ((k % 2) == 0) {
                } else {
                    result[k] = result[k].slice(1, -1);
                    let number = result[k].split(".");
                    let l = 0;
                    while (l < number.length) {
                        if ((l % 2) == 0) {
                            number[l] = number[l] * 256;
                        } else {
                            number[l] = parseInt(number[l-1]) + parseInt(number[l]);
                            if (l == 1) {
                                hex = number[l].toString(16);
                            } else {
                                hex = hex + ":" + number[l].toString(16);
                            }
                        }
                        l++;
                    }
                }
                k++;
            }
            result[1] = hex;
            part[0] = result[0] + ':"' + result[1] + '"';
        }
        j++
    }
    item[i] = part[0] + ',' + part[1];
    if (i == 0) {
        value = item[i];
    } else {
        value = value + '},{' + item[i];
    }
    i++;
};
return value;

[WouterPeeters]

I recreated the code with json parse

// Parse the input string into a JavaScript array of objects
var data = JSON.parse(value);
// Iterate over each object in the array and add the {#SNMPHEX} key
var i = 0;
while (i < data.length) {
var item = data[i];
var snmpIndex = item['{#SNMPINDEX}'];
var parts = snmpIndex.split('.');
var ipv6 = [];
var j = 0;
while (j < parts.length) {
var combined = (parseInt(parts[j], 10) << 8) + parseInt(parts[j + 1], 10);
ipv6.push(combined.toString(16)); // no padding with leading zeros
j += 2;
}
item['{#SNMPHEX}'] = ipv6.join(':');
i++;
}
// Convert the modified array back to a JSON string
var output = JSON.stringify(data, null, 2);
return output;

[WouterPeeters]

The problem is defining a variable with "let". If I replace "let" with "var" the error disappears.
Now I am stuck with a new error. "TypeError: undefined not callable (property 'replaceAll' of '{"{#SNMPINDEX}"
I traced this to an old version of JS where replaceAll is not yet implemented. I can fix this in my editor by manually defining the function. but this doesn't work in Zabbix.

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
function replaceAll(str, find, replace) {
  return str.replace(new RegExp(escapeRegExp(find), 'g'), replace);
}

Edit:
It appears Zabbix JS doesn't handle functions well. I solved the above be putting the function straight in the code.

value = value.replace(new RegExp("},{".replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'g'), "}£{");

Edit2:
After later consideration is better to convert the value string back to JSON and change the JSON values.
I will have to rewrite the entire code for this...

[WouterPeeters]

I recreated the code with json parse

// Parse the input string into a JavaScript array of objects
var data = JSON.parse(value);
// Iterate over each object in the array and add the {#SNMPHEX} key
var i = 0;
while (i < data.length) {
var item = data[i];
var snmpIndex = item['{#SNMPINDEX}'];
var parts = snmpIndex.split('.');
var ipv6 = [];
var j = 0;
while (j < parts.length) {
var combined = (parseInt(parts[j], 10) << 8) + parseInt(parts[j + 1], 10);
ipv6.push(combined.toString(16)); // no padding with leading zeros
j += 2;
}
item['{#SNMPHEX}'] = ipv6.join(':');
i++;
}
// Convert the modified array back to a JSON string
var output = JSON.stringify(data, null, 2);
return output;