CODEWITHSUNDEEP
javascript
Fred Zimmerman
Fred Zimmerman

Reputation: 1238

concatenate content files in loop

I want to loop over a list of entitlements and create a concatenated json array. I want to loop over several data arrays and concatenate the ones that the user is entitled to.

const ROOSEVELT = require("./content/roosevelt") // these are .js arrays
const AMBITION = require("./content/ambition")
const CHAUCER = require ("./content/chaucer")

// beginning main function
exports.function = function (searchTerm, searchAuthor, searchQOTD) {

var entitlements = GET_REMOTE.checkEntitlements()

// returns json ["ROOSEVELT", "AMBITION", "CHAUCER"] from API server

var entitled_content = [] //empty target array

entitlements.forEach(function(item, array)

// loop over the list of entitlements

{ //this is where I want to concatenate the constants 
// ROOSEVELT, AMBITION, and CHAUCER
// I need a one liner that adds each constant to the entitled_content array.

;});

// main function continues

Upvotes: 1

Views: 101

Answers (1)

romellem
romellem

Reputation: 6491

You need to allow your imports to be looked up by way of a string since that is what checkEntitlements() is returning.

An easy way to is add this imports to a lookup object:

const ROOSEVELT = require("./content/roosevelt") // these are .js arrays
const AMBITION = require("./content/ambition")
const CHAUCER = require ("./content/chaucer")

const lookup = {
    ROOSEVELT: ROOSEVELT,
    AMBITION: AMBITION,
    CHAUCER: CHAUCER
};

The downside with this is, you have the manually maintain your lookup object. If you want this to be automatically generated based on the files you are importing, you can look to use an NPM module such as require-dir, that'll return this object for you to use directly.

const requireDir = require('require-dir');
const lookup = requireDir('./content');

Next, when you loop through your array of strings, I think you want your entitled_content to be a flat list. If so, the concat function is what you want.

Otherwise, entitled_content.push would simply append your data to your array.

const ROOSEVELT = require('./content/roosevelt'); // these are .js arrays
const AMBITION = require('./content/ambition');
const CHAUCER = require('./content/chaucer');

const lookup = {
    ROOSEVELT,
    AMBITION,
    CHAUCER,
};

exports.function = function(searchTerm, searchAuthor, searchQOTD) {
    // returns json ["ROOSEVELT", "AMBITION", "CHAUCER"] from API server
    var entitlements = GET_REMOTE.checkEntitlements();

    var entitled_content = [];

    entitlements.forEach(function(item) {
        if (lookup[item]) {
            entitled_content = entitled_content.concat(lookup[item]);
        }
    });
};

Upvotes: 1

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