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42 lines
855 B
42 lines
855 B
'use strict';
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module.exports = function mode(key) {
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var values = [];
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var highestCount = 1;
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if (!this.items.length) {
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return null;
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}
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this.items.forEach(function (item) {
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var tempValues = values.filter(function (value) {
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if (key !== undefined) {
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return value.key === item[key];
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}
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return value.key === item;
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});
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if (!tempValues.length) {
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if (key !== undefined) {
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values.push({ key: item[key], count: 1 });
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} else {
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values.push({ key: item, count: 1 });
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}
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} else {
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tempValues[0].count += 1;
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var count = tempValues[0].count;
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if (count > highestCount) {
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highestCount = count;
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}
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}
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});
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return values.filter(function (value) {
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return value.count === highestCount;
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}).map(function (value) {
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return value.key;
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});
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};
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