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64 lines
1.2 KiB
64 lines
1.2 KiB
2 years ago
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'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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if (length === 0) {
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return done(null, results);
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}
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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, key, 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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