Using Enum References to Get Right Array Value

Question

I have a situation where I have an object where some of the properties contain arrays like so:

current: { primary: [ [Object] ], secondary: [ [Object] ], tertiary: [], quaternary: [], quinary: [], senary: [], septenary: [], octonary: [], nonary: [], denary: [] },

To find the correct one, I could do something not very elegant, like this:

 getLastActive = (current) => { let lastActive; if(current.primary[0] && current.primary[0].coverage.purchaser.name !== 'customer') { lastActive = current.primary[0]; } else if(current.secondary[0] && current.secondary[0].coverage.purchaser.name !== 'customer') { lastActive = current.secondary[0]; } else if(current.tertiary[0] && current.tertiary[0].coverage.purchaser.name !== 'customer') { lastActive = current.tertiary[0]; } else if(current.quaternary[0] && current.quaternary[0].coverage.purchaser.name !== 'customer') { lastActive = current.quaternary[0]; } else if(current.senary[0] && current.senary[0].coverage.purchaser.name !== 'customer') { lastActive = current.senary[0]; } else if(current.septenary[0] && current.septenary[0].coverage.purchaser.name !== 'customer') { lastActive = current.septenary[0]; } else if(current.octonary[0] && current.octonary[0].coverage.purchaser.name !== 'customer') { lastActive = current.octonary[0]; } else if(current.nonary[0] && current.nonary[0].coverage.purchaser.name !== 'customer') { lastActive = current.nonary[0]; } else if(current.denary[0] && current.denary[0].coverage.purchaser.name !== 'customer') { lastActive = current.denary[0]; } return lastActive; } const enums = { ORDER: { 1: "primary", 2: "secondary", 3: "tertiary", 4: "quaternary", 5: "quinary", 6: "senary", 7: "septenary", 8: "octonary", 9: "nonary", 10: "denary", }, };

While that works, what I'd prefer to do is something more succinct like this:

 getLastActive = (current) => { let lastActive; let sequence = enums.ORDER['some value']; // Not sure what goes here if(current[enums.ORDER[sequence]][0].coverage.purchaser.name !== 'customer') { lastActiveCommercial = current[enums.ORDER[sequence]][0]; } return lastActive; }

I've seen this done elsewhere. However, what I'm unclear on is what I can put in this line, to get the right array reference:

 let sequence = enums.ORDER['some value']; // Not sure what goes here

To be clear, I know that the data I want is the first property of primary, secondary, tertiary, etc., that is not an empty array, and where coverage.purchaser.name !== 'customer'.

What can I use to pull this out based on the data above?

majusebetter · Accepted Answer · 2021-10-06 13:25:11Z

You could use a simple array as order representation. It can be created from the enum definition using Object.values(enums.ORDER).

const current = { primary: [{ coverage: { purchaser: { name: 'customer' } } }], secondary: [{ coverage: { purchaser: { name: 'purchaser' } } }], tertiary: [], quaternary: [], quinary: [], senary: [], septenary: [], octonary: [], nonary: [], denary: [] }; const enums = { ORDER: { 1: "primary", 2: "secondary", 3: "tertiary", 4: "quaternary", 5: "quinary", 6: "senary", 7: "septenary", 8: "octonary", 9: "nonary", 10: "denary", } }; function getLastActive(current) { let lastActive; const ORDER = Object.values(enums.ORDER); for (const order of ORDER) { const item = current[order][0]; if (item && item.coverage.purchaser.name !== "customer") { lastActive = item; break; } } return lastActive; } console.log(JSON.stringify(getLastActive(current), null, 2));

I can't change ORDER itself, because that enums object is being used elsewhere. I would need to generate an array from the enums object.
Sorry, you didn't mention that in your question. Updated my answer accordingly.

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