discourse/app/assets/javascripts/select-kit/mixins/utils.js.es6

import Mixin from "@ember/object/mixin";
const { get } = Ember;

export default Mixin.create({
  defaultItem(value, name) {
    if (this.selectKit.valueProperty) {
      const item = {};
      item[this.selectKit.valueProperty] = value;
      item[this.selectKit.nameProperty] = name;
      return item;
    } else {
      return name || value;
    }
  },

  itemForValue(value) {
    if (this.selectKit.valueProperty) {
      return this.mainCollection.findBy(this.selectKit.valueProperty, value);
    } else {
      return value;
    }
  },

  getProperty(item, property, options = { definedOnly: true }) {
    const { definedOnly } = options;

    if (item && typeof property === "string") {
      const attempt = get(item, property);
      if (attempt) {
        return attempt;
      }
    }

    property = get(this.selectKit, property);

    if (!item) {
      return null;
    }

    if (!property && definedOnly) {
      return null;
    } else if (!property) {
      return item;
    } else if (typeof property === "string") {
      return get(item, property);
    } else {
      return property(item);
    }
  },

  getValue(item) {
    return this.getProperty(item, "valueProperty", { definedOnly: false });
  },

  getName(item) {
    return this.getProperty(item, "nameProperty", { definedOnly: false });
  },

  findValue(content, item) {
    const property = Ember.get(this.selectKit, "valueProperty");

    if (!property) {
      if (content.indexOf(item) > -1) {
        return item;
      }
    } else if (typeof property === "string") {
      return content.findBy(property, this.getValue(item));
    } else {
      const value = this.getValue(item);
      return content.find(contentItem => {
        return this.getValue(contentItem) === value;
      });
    }
  },

  _isNumeric(input) {
    return !isNaN(parseFloat(input)) && isFinite(input);
  },

  _normalize(input) {
    if (input) {
      input = input.toLowerCase();

      if (typeof input.normalize === "function") {
        input = input.normalize("NFD").replace(/[\u0300-\u036f]/g, "");
      }
    }

    return input;
  }
});