How to chain methods dynamically in JavaScript

javascript mongodb mongoose methods populate

const result = fields.reduce((r, path) => r.populate(path), document.findById(id));

Or somewhat more verbosely:

let result = document.findById(id);for (let i = 0; i < fields.length; i++) {    result = result.populate(fields[i]);}

javascript mongodb mongoose methods populate

I'm not sure if it's what you're looking for:

let query = document.findById(id)for (const field of fields) {  query = query.populate(field)}const result = await query

if you want to go with ES6 .reduce():

const result = await fields.reduce((query, field) => query.populate(field), document.findById(id))

Edit:

From mongoose v3.6 you can use also .populate(fields.join(' '))

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