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21 lines
521 B
JavaScript
21 lines
521 B
JavaScript
"use strict";
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// Inverts an object of arrays, eg. {a: [x, y], b: [x, z]} becomes {x: [a, b], y: [a], z: [b]}
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// TODO: See if this can be replaced with an off-the-shelf module with equivalent semantics, something transpose-y maybe?
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module.exports = function invertMapping(mapping) {
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let newObject = {};
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for (let [ key, values ] of Object.entries(mapping)) {
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for (let value of values) {
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if (newObject[value] == null) {
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newObject[value] = [];
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}
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newObject[value].push(key);
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}
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}
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return newObject;
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};
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