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