ut2/lib/get.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var native = require('./internals/native.js');
var isNil = require('./isNil.js');
var isUndefined = require('./isUndefined.js');
var toPath = require('./toPath.js');

function baseGet(object, key) {
    var paths = toPath(key, object);
    var length = paths.length;
    var index = 0;
    while (!isNil(object) && index < length) {
        object = object[paths[index++]];
    }
    return index && index === length ? object : native.nativeUndefined;
}
function get(object, key, defaultValue) {
    var result = isNil(object) ? native.nativeUndefined : baseGet(object, key);
    return isUndefined(result) ? defaultValue : result;
}

module.exports = get;