@antv/util/lib/lodash/flatten.js

> AntV 底层依赖的工具库，不建议在自己业务中使用。

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var is_array_1 = tslib_1.__importDefault(require("./is-array"));
/**
 * Flattens `array` a single level deep.
 *
 * @param {Array} arr The array to flatten.
 * @return {Array} Returns the new flattened array.
 * @example
 *
 * flatten([1, [2, [3, [4]], 5]]);  // => [1, 2, [3, [4]], 5]
 */
var flatten = function (arr) {
    if (!(0, is_array_1.default)(arr)) {
        return [];
    }
    var rst = [];
    for (var i = 0; i < arr.length; i++) {
        rst = rst.concat(arr[i]);
    }
    return rst;
};
exports.default = flatten;
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