| 1 | const { passOrGet } = require('./function');
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| 2 | const expose = require('./expose');
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| 3 |
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| 4 | /**
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| 5 | * Iterate a `Map` of key/value functions until the first *key*
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| 6 | * that produces a truthy result when called and return the outcome
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| 7 | * of calling the associated *value*.
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| 8 | *
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| 9 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
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| 10 | *
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| 11 | * @param {Object} options
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| 12 | * @param {Map} options.map
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| 13 | * @param {Array} [options.keyArguments=[]]
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| 14 | * @param {Array} [options.valueArguments=[]]
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| 15 | * @param {*} [options.fallback]
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| 16 | * @return {*}
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| 17 | */
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| 18 | function reduceMap({
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| 19 | map,
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| 20 | keyArguments = [],
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| 21 | valueArguments = [],
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| 22 | fallback,
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| 23 | }) {
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| 24 | for (const [mapKey, mapValue] of map) {
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| 25 | if (mapKey(...keyArguments)) {
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| 26 | return mapValue(...valueArguments);
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | return passOrGet(fallback, valueArguments);
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| 31 | }
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| 32 |
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| 33 | module.exports = expose({
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| 34 | reduceMap,
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| 35 | });
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