I would like to read a very very large file into a JavaScript array in node.js. So if the file is like this: first line two three ... ... I would have the array: ['first line','two','three', ... , ... ] The function would look like this: var array = load(filename); Therefore the idea of loading it all as a string and then split it is not acceptable. If you can fit the final data into
我想在node.js中将非常大的文件读入JavaScript数组中。 所以如果这个文件是这样的: first line two three ... ... 我会有这个数组: ['first line','two','three', ... , ... ] 该函数看起来像这样: var array = load(filename); 因此,将其全部加载为字符串然后拆分它的想法是不可接受的。 如果你可以将最终的数据放入一个数组中,那么你是否也可以将它放入一个字符串中并将其拆分,如前所述? 无论如何,如果
This question already has an answer here: Read a file one line at a time in node.js? 25 answers var fs = require('fs'); var readline = require('readline'); var stream = require('stream'); var instream = fs.createReadStream('./test.txt'); var outstream = new stream; var rl = readline.createInterface(instream, outstream); var arr = []; rl.on('line', function(line) { // process line here
这个问题在这里已经有了答案: 在node.js中一次读取一行文件? 25个答案 var fs = require('fs'); var readline = require('readline'); var stream = require('stream'); var instream = fs.createReadStream('./test.txt'); var outstream = new stream; var rl = readline.createInterface(instream, outstream); var arr = []; rl.on('line', function(line) { // process line here arr.push(line); }); rl.on('
I am trying to read a large file one line at a time. I found a question on Quora that dealt with the subject but I'm missing some connections to make the whole thing fit together. var Lazy=require("lazy"); new Lazy(process.stdin) .lines .forEach( function(line) { console.log(line.toString()); } ); process.stdin.resume(); The bit that I'
我正在尝试一次读取一行大文件。 我在Quora上发现了一个关于这个问题的问题,但我错过了一些联系以使整个事情合在一起。 var Lazy=require("lazy"); new Lazy(process.stdin) .lines .forEach( function(line) { console.log(line.toString()); } ); process.stdin.resume(); 我想知道的一点是,我可能会如此示例一次从文件而不是STDIN读取一行。 我试过了: fs.open('
I would like to customize my search form. I am using Google Search Service and have it linked to my domain and so on. I chose the two column layout in the Control Panel, but however, I want to do something onSubmit of the form. So I tried to put an actionlistener in jQuery into the form, however does not work. Then I thought google certainly provides something for that. And yes they do.
我想定制我的搜索表单。 我正在使用Google搜索服务并将其链接到我的网域等。 我在控制面板中选择了两个列布局,但是,我想对窗体的提交进行一些操作。 所以我试图把jQuery中的actionlistener放入表单中,但是不起作用。 然后,我认为谷歌肯定提供了一些东西。 是的,他们这样做。 它被称为: setOnSubmitCallback() http://code.google.com/apis/websearch/docs/reference.html 不幸的是,我没有得到它。 到目前
If I want to call a function like this: moo({ a: 4 }); Normally i'd have to phrase my function definition like this: function moo(myArgObj) { print(myArgObj.a); } But this awesome syntax is totally valid in spidermonkey for defining functions: function moo({ a, b, c }) { // valid syntax! print(a); // prints 4 } Any ideas where I can find info on this? I'd like to see just h
如果我想调用这样的函数: moo({ a: 4 }); 通常我必须像这样描述我的函数定义: function moo(myArgObj) { print(myArgObj.a); } 但是这个令人敬畏的语法在spidermonkey中完全有效,用于定义函数: function moo({ a, b, c }) { // valid syntax! print(a); // prints 4 } 任何想法,我可以找到这方面的信息? 我想看看这个功能有多强大。 我刚才在javascript / ecmascript 5中看到了它,但我无法再找到它了。
In a project I'm collaborating on, we have two choices on which module system we can use: Importing modules using require , and exporting using module.exports and exports.foo . Importing modules using ES6 import , and exporting using ES6 export Are there any performance benefits to using one over the other? Is there anything else that we should know if we were to use ES6 modules over N
在我正在合作的一个项目中,我们有两种选择我们可以使用的模块系统: 导入使用模块require ,并利用出口module.exports和exports.foo 。 使用ES6 import导入模块,并使用ES6 export 使用其中一个有什么性能好处? 如果我们使用Node6上的ES6模块,还有什么我们应该知道的吗? 使用其中一个有什么性能好处? 请记住,目前还没有支持ES6模块的JavaScript引擎。 你自己说过你在使用Babel。 无论如何, module.exports默
Currently in ES5 many of us are using the following pattern in frameworks to create classes and class variables, which is comfy: // ES 5 FrameWork.Class({ variable: 'string', variable2: true, init: function(){ }, addItem: function(){ } }); In ES6 you can create classes natively, but there is no option to have class variables: // ES6 class MyClass { const MY_CO
目前在ES5中,我们中的很多人在框架中使用以下模式来创建类和类变量,这很简单: // ES 5 FrameWork.Class({ variable: 'string', variable2: true, init: function(){ }, addItem: function(){ } }); 在ES6中,你可以在本地创建类,但是没有选择类变量的选项: // ES6 class MyClass { const MY_CONST = 'string'; // <-- this is not possible in ES6 constructor(){ this
How do I pass a function as a parameter without the function executing in the "parent" function or using eval() ? (Since I've read that it's insecure.) I have this: addContact(entityId, refreshContactList()); It works, but the problem is that refreshContactList fires when the function is called, rather than when it's used in the function. I could get around it using e
如何将函数作为参数传递,而不在“父”函数中执行函数或使用eval() ? (因为我读过它是不安全的。) 我有这个: addContact(entityId, refreshContactList()); 它可以工作,但问题是refreshContactList在函数被调用时触发,而不是在函数中使用。 根据我读过的内容,我可以用eval()来解决它,但这不是最好的做法。 我如何在JavaScript中传递一个函数作为参数? 你只需要删除括号: addContact(entityId, refreshContactL
I have an annoying bug in on a webpage: "date.GetMonth() is not a function". So I suppose that I am doing something wrong since somewhere and the object date is not an object of type Date. How can I check for a datatype in Javascript? I tried to add a if(date) but it doesn't work. function getFormatedDate(date) { if (date) { var month = date.GetMonth(); } } So if
我在网页上有一个烦人的错误:“date.GetMonth()不是一个函数”。 所以我想我从某个地方做错了什么,并且对象日期不是Date类型的对象。 我如何检查Javascript中的数据类型? 我试图添加一个if(日期),但它不起作用。 function getFormatedDate(date) { if (date) { var month = date.GetMonth(); } } 因此,如果我想写防御性代码并防止日期(不是一种)被格式化,我该怎么做? 谢谢! 更新:我不想检
I am debugging some JavaScript, and can't explain what this || does? function (title, msg) { var title = title || 'Error'; var msg = msg || 'Error on Request'; } Can someone give me an hint, why this guy is using var title = title || 'ERROR' var title = title || 'ERROR' ? I sometimes see it without a var declaration as well. It means the title argument is optional
我正在调试一些JavaScript,并且无法解释这个|| 呢? function (title, msg) { var title = title || 'Error'; var msg = msg || 'Error on Request'; } 有人可以给我一个提示,为什么这个人正在使用var title = title || 'ERROR' var title = title || 'ERROR' ? 我有时也会在没有var声明的情况下看到它。 这意味着title参数是可选的。 所以如果你调用没有参数的方法,它将使用默认值"Erro