devextreme/dist/transpiled/core/utils/array.js

HTML5 JavaScript Component Suite for Responsive Web Development

"use strict";

var isDefined = require("./type").isDefined,
    each = require("./iterator").each,
    objectUtils = require("./object");

var isEmpty = function isEmpty(entity) {
    return Array.isArray(entity) && !entity.length;
};

var wrapToArray = function wrapToArray(entity) {
    return Array.isArray(entity) ? entity : [entity];
};

var intersection = function intersection(a, b) {
    if (!Array.isArray(a) || a.length === 0 || !Array.isArray(b) || b.length === 0) {
        return [];
    }

    var result = [];

    each(a, function (_, value) {
        var index = inArray(value, b);

        if (index !== -1) {
            result.push(value);
        }
    });

    return result;
};

var removeDuplicates = function removeDuplicates(from, what) {
    if (!Array.isArray(from) || from.length === 0) {
        return [];
    }

    if (!Array.isArray(what) || what.length === 0) {
        return from.slice();
    }

    var result = [];

    each(from, function (_, value) {
        var index = inArray(value, what);

        if (index === -1) {
            result.push(value);
        }
    });

    return result;
};

var normalizeIndexes = function normalizeIndexes(items, indexParameterName, currentItem, needIndexCallback) {
    var indexedItems = {},
        parameterIndex = 0;

    each(items, function (index, item) {
        index = item[indexParameterName];
        if (isDefined(index)) {
            indexedItems[index] = indexedItems[index] || [];

            if (item === currentItem) {
                indexedItems[index].unshift(item);
            } else {
                indexedItems[index].push(item);
            }
            delete item[indexParameterName];
        }
    });

    objectUtils.orderEach(indexedItems, function (index, items) {
        each(items, function () {
            if (index >= 0) {
                this[indexParameterName] = parameterIndex++;
            }
        });
    });

    each(items, function () {
        if (!isDefined(this[indexParameterName]) && (!needIndexCallback || needIndexCallback(this))) {
            this[indexParameterName] = parameterIndex++;
        }
    });

    return parameterIndex;
};

var inArray = function inArray(value, object) {
    if (!object) {
        return -1;
    }
    var array = Array.isArray(object) ? object : object.toArray();

    return array.indexOf(value);
};

var merge = function merge(array1, array2) {
    for (var i = 0; i < array2.length; i++) {
        array1[array1.length] = array2[i];
    }

    return array1;
};

exports.isEmpty = isEmpty;
exports.wrapToArray = wrapToArray;
exports.intersection = intersection;
exports.removeDuplicates = removeDuplicates;
exports.normalizeIndexes = normalizeIndexes;
exports.inArray = inArray;
exports.merge = merge;