ut2/lib/findKey.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var tslib = require('tslib');
var forEach = require('./forEach.js');
var helpers = require('./internals/helpers.js');
var isMap = require('./isMap.js');
var isObject = require('./isObject.js');

var findKey = function (obj, predicate) {
    var e_1, _a;
    if (predicate === void 0) { predicate = helpers.stubFlase; }
    var key;
    if (isMap(obj)) {
        try {
            for (var obj_1 = tslib.__values(obj), obj_1_1 = obj_1.next(); !obj_1_1.done; obj_1_1 = obj_1.next()) {
                var _b = tslib.__read(obj_1_1.value, 2), k = _b[0], v = _b[1];
                if (predicate(v, k)) {
                    key = k;
                    break;
                }
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (obj_1_1 && !obj_1_1.done && (_a = obj_1.return)) _a.call(obj_1);
            }
            finally { if (e_1) throw e_1.error; }
        }
    }
    else if (isObject(obj)) {
        forEach(obj, function (v, k) {
            if (predicate(v, k)) {
                key = k;
                return false;
            }
        });
    }
    return key;
};

module.exports = findKey;