JSFiddle - React, Tailwind, and code Playground
by Avi Algaly
JavaScript
let jsonMsg = {
type: 'data',
message_id: 22,
err: 0
};
let messages = [
{"type":"command","cmd":"noop","message_id":0},
{"type":"command","cmd":"noop","message_id":1},
{"type":"command","cmd":"noop","message_id":2}
]
let msgInx = messages.findIndex((itm) => itm.message_id === jsonMsg.message_id);
console.log(msgInx)