StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics https://doi.org/10.1109/TVCG.2020.3030352
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StackGenVis/frontend/node_modules/now-and-later/lib/map.js

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'use strict';
var once = require('once');
var helpers = require('./helpers');
function map(values, iterator, extensions, done){
// allow for extensions to not be specified
if(typeof extensions === 'function'){
done = extensions;
extensions = {};
}
// handle no callback case
if(typeof done !== 'function'){
done = helpers.noop;
}
done = once(done);
// will throw if non-object
var keys = Object.keys(values);
var length = keys.length;
var count = length;
var idx = 0;
// return the same type as passed in
var results = helpers.initializeResults(values);
var exts = helpers.defaultExtensions(extensions);
for(idx = 0; idx < length; idx++){
var key = keys[idx];
next(key);
}
function next(key){
var value = values[key];
var storage = exts.create(value, key) || {};
exts.before(storage);
iterator(value, once(handler));
function handler(err, result){
if(err){
exts.error(err, storage);
return done(err, results);
}
exts.after(result, storage);
results[key] = result;
if(--count === 0){
done(err, results);
}
}
}
}
module.exports = map;