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855 B

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