Creating a Lookup Table with double digits

[Jaime_G]

Hi community!

I've been using a look up function that I've created for some time now and it's been working well,,,, until today that I ran into a scenario that has double digits.

When I inject the value 1 through 9 everything works perfectly. When I start doing double digits I get a double replacement, see picture of the output of a debug node when I inject the value 1, 9, 11, 15.

When I inject 11 the output replaces two times the number 1.

Any suggestions on how to read and replace "11" versus "1 and 1" ?

[Steve-Mcl]

re-write the function in reverse order will work, but it may not be the best solution.

Can you show us what is inside msg.payload immediately before this function?

[Hopperpop]

You can make use of regular expressions to look if there is no digit before and after the match:

You can find a better explanation why it works here: regex101

EDIT:
Maybe it even better to use /(?<!(\w))1(?!\w)/gi. As you also don't want to replace "L1" with anything, only numbers that aren't next to any word character: a-zA-Z0-9_.

[E1cid]

If msg.payload coming into the function is a number, then you could just use a lookup array.
e.g

[{"id":"3fea8003.98bac8","type":"inject","z":"30af2d3e.d94ea2","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"3","payloadType":"num","x":180,"y":120,"wires":[["88e2c287.49512"]]},{"id":"88e2c287.49512","type":"function","z":"30af2d3e.d94ea2","name":"","func":"const lookup = [\n    null,\n    \"L1\",\n    \"L2\",\n    \"L1-L2\",\n    \"L3\",\n    \"etc\"\n];\nmsg.payload = lookup[msg.payload] + \" Connected\";\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":340,"y":140,"wires":[["4e45a50.133c95c"]]},{"id":"bfac3654.beb8f","type":"inject","z":"30af2d3e.d94ea2","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"4","payloadType":"num","x":175.3333282470703,"y":157.33334350585938,"wires":[["88e2c287.49512"]]},{"id":"4e45a50.133c95c","type":"debug","z":"30af2d3e.d94ea2","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":560,"y":120,"wires":[]}]

const lookup = [
    null,
    "L1",
    "L2",
    "L1-L2",
    "L3",
    "etc"
];
msg.payload = lookup[msg.payload] + " Connected";
return msg;

[Jaime_G]

Thanks for this suggestion Steve, I did in fact try this out before reaching out to the community. It provided an unexpected result which caused me to seek advice from the pros.

A reply from Hopperpop did the trick

[Jaime_G]

This did the trick !

Many thanks to your suggestion Hopperpop!!!

This community is awesome!