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4 years ago
'use strict';
module.exports = function flip() {
var _this = this;
var collection = {};
if (Array.isArray(this.items)) {
Object.keys(this.items).forEach(function (key) {
collection[_this.items[key]] = Number(key);
});
} else {
Object.keys(this.items).forEach(function (key) {
collection[_this.items[key]] = key;
});
}
return new this.constructor(collection);
};