Here are a couple of tips when working with search.lookupFields() in SuiteScript 2.1.

Assign variables automatically

It's common to retrieve one or more fields from a record using search.lookupFields. Often I see this done in two or more steps, and usually these steps can be combined.

I'll often see code like this:

const results = search.lookupFields({
    type: search.Type.CUSTOMER,
    id: 12345,
    columns: [
        'companyname'
    ]
});

const companyName = results['companyname'];

We can combine the retrieval of the data and the assigning of the variable in the same step like this:

const companyName = search.lookupFields({
    type: search.Type.CUSTOMER,
    id: 12345,
    columns: [
        'companyname'
    ]
})['companyname'];

With object destructuring, we can even retrieve and assign multiple values in the same line of code.

const { companyname, email, phone } = search.lookupFields({
    type: search.Type.CUSTOMER,
    id: 12345,
    columns: [ 'companyname', 'email', 'phone' ]
});

If we want to assign one of these values to a different variable name, we can assign that variable here as well. For example, if we want to use the variable customer instead of companyname then we can do this.

const { companyname: customer, email, phone } = search.lookupFields({
    type: search.Type.CUSTOMER,
    id: 12345,
    columns: [ 'companyname', 'email', 'phone' ]
});

Access Connected Data

You can access joined data when using search.lookupFields() . For example, if you have an invoice ID in your script, you can access data from the Sales Order which created that invoice in a single call using dot notation on the createdfrom field.

const salesOrderNumber = search.lookupFields({
		type: search.Type.INVOICE,
		id: invoiceId,
		columns: [ 'createdfrom.tranid' ]
})['createdfrom.tranid'];