我正在尝试为amqplib npm包编写一个reasonml绑定:
特别是这个函数:
class type amqpMessageT = [@bs] {
pub content: nodeBuffer
};
type amqpMessage = Js.t(amqpMessageT);
type gottenMessage = Js.Nullable.t(amqpMessage);
type qualifiedMessage = Message(gottenMessage) | Boolean(bool);
class type amqpChannelT = [@bs] {
我正在尝试从映射中转换可迭代的键,但是当我这样做时,我得到了错误:
statistics.produceTypeData.keys不是一个函数
我遵循这个问题的答案:使它工作。
当我尝试另一种方法(使用Array.from(statistics.produceTypeData.keys()))时,我得到了一个不同的错误,即:
类型'IterableIterator‘不是数组类型。
在注释中,我已经看到,在本例中,应该将Array.from()语句括在spread语法中,但当我这样做时,也会得到错误statistics.produceTypeData.keys is no
在类型记录中,我们可以使用以下方法将字符串转换为数字:
let asText: string = "123";
let asNumerals: number = +asText;
如何在布尔类型中实现相同的功能:
let asText: string = "true";
console.log(+asText); // NaN
console.log(typeof asText); // string
let b: boolean = +asText; // does not compile
纯JS方法产生了正确的结果:
let b: boolean = asT
我试过这个:
Handle<Boolean> B = arg[0];
编译器:
fatal error: assigning
to 'v8::Boolean *volatile'
from incompatible type 'v8::Value *'
TYPE_CHECK(T, S);
我:
Handle<Boolean> B = Handle<Boolean>::Cast(arg[0]);
编译器:
fatal error: no member named 'Cast' in 'v
我之所以问这个问题,是因为如果您在Java中尝试它:
boolean a = true, b = false;
boolean c = a | b;
然后在c变量中将是true值。但是如果我们在JS中运行类似的代码:
var a = false, b = true;
var c = a | b;
然后在c变量中将是1值。如何解释这种奇怪的行为?
我正在使用nestjs/graphql,并且我为graphql突变做了一个dto,其中我使用了类验证器选项,如@IsString()和@IsBoolean()。为此,我安装了class-validator和class-transformer。但当我进行突变时,它会给我一个前所未有的错误。我用谷歌搜索了一下,但什么也没找到。错误如下: [Nest] 5872 - 2021. 11. 21. 오후 7:56:09 ERROR [ExceptionsHandler] classTransformer.plainToClass is not a function
TypeError: clas
我完全是Javascript的新手,在尝试过布尔表达式的所有可能组合后,我只剩下以下代码。除了where effectiveDateSelected = true和throughDateSelected = false之外,为什么下面的JS布尔逻辑都会失败
// initialisation
var effectiveDateSelected = new Boolean(false);
var throughDateSelected = new Boolean(false);
// values
每当我试图调用任何来自无服务器框架lambda的调用时,我都会得到以下错误
[offline] _____ HANDLER RESOLVED _____
offline: Failure: product.hasMany called with something that's not a subclass of Sequelize.Model
Error: product.hasMany called with something that's not a subclass of Sequelize.Model
at Function.hasMany (C:\User
我有两个数据类(我没有编写业务逻辑),我试图在存储中使用这些类。我通过装饰解决了那家商店的问题。它们被定义为:
// data classes; // these would be in separate file.
class PayRate {
/**
* @param {number} storeId The store id of the pay rate. (-1 for all)
* @param {number} empId The id of the employee. (-1 for all)
* @param {number} taskId The
我是swagger-node的新手,我正在创建一个返回boolean类型数据的API方法。该方法的yaml为:
/IsBooting:
get:
summary: "Returns if the device is booting"
description: "Returns true when is in booting state"
x-swagger-router-controller: printer_status
operationId: IsBooting
responses:
20
当试图构建我的react应用程序时,我会得到一个TypeScript 'declare' fields must first be transformed by @babel/plugin-transform-typescript.错误。但我不明白为什么,因为我使用的是@babel/preset-typescript。如何纠正此错误?
//craco.config.js
const path = require("path");
const CracoAlias = require("craco-alias");
module.exports
我尝试将终端args中的字符串转换为自定义类型的数组,但编译器仍然认为它是字符串,不允许我对每个字符串执行一个字符串。这是代码
type Delivery = [number, number];
const deliveries: [Delivery] = (argv[2] as unknown) as [Delivery];
function sampleChecks() : Boolean {
console.log(typeof deliveries); // prints string
let deliveriesToCheck: number[] = [];
我有以下代码:
//function fires
createNewEvent = () => {
if(Boolean(this.state.newEventName)){
console.log(this.indexToDay) //logs right value of date
newEvent(
this.state.newEventName,
this.indexToDay,
this.pxToTime(this.state.initial.top),