Easy way to resize image in Node.js? [closed] - javascript

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After data is loaded from filesystem, which model worth to use to resize image and return to client?
fs.readFile(process.env.OPENSHIFT_DATA_DIR + request.headers['filename'], function read(err, data) {
var w = request.headers['w']
var h = request.headers['h']
response.writeHead(200)
// CODE TO RESIZE DATA
response.write(data)
response.end()
})

Use ImageMagick:
https://www.npmjs.com/package/imagemagick
Or other modules from npm:
https://www.npmjs.com/package/image-resizer
https://www.npmjs.com/package/resize-image
https://www.npmjs.com/package/easyimage

Related

How to iterate and append characters of an array by push [closed]

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var charArray=[a,b,c]
I want to have a new array as following:
var charArrayNew=[a, ab, abc]
Please suggest how to get the result of charArrayNew in ES6 Javascript.
You could do this:
const charArray=['a','b','c'];
const answer = charArray.map((_,i,ar)=>ar.slice(0,i+1).join(""));
console.log(answer);
// or, alternatively:
fn=(ar,res=[])=>(
ar.reduce((a,c)=>(res.push(a+=c),a),""),res );
console.log(fn(charArray))

How can I detect if user has successfully alerted a thing (I'm making an XSS game) [closed]

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The page just echoes the user input using GET. I have no idea on what concept to apply to detect if the user has alerted something
The easiest approach would probably be to replace the alert method with your own.
const log = [];
alert = function(alert) {
return (value) => {
log.push(value);
alert(value);
};
}(alert);
alert("Hello!");
console.log(log);

Show distance from a polilyne in MapBox [closed]

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I was developing this polilynes code, and I need to display the polilyne distance completely, how do I do this?
Here below is the code I am using:
https://drive.google.com/file/d/1eQg-hnOFuRWOPWUhg8Lqq38Lc6Pi9uJc/view?usp=sharing
You can calculates geojson with libs like Turf.js.
For example, turf/length measures length of lineString, like below.
const line = turf.lineString([
[-53.08074, -25.766767],
[-53.097358, -25.77123],
[-53.117901, -25.798796],
[-53.147227, -25.801503],
[-53.187904, -25.812659],
[-53.235429, -25.811208],
[-53.276227, -25.802679],
[-53.305865, -25.788242]
]);
const len = turf.length(line, { units: "kilometers" }); // 24.96224597809012

socket.io+ Node:Object #<Namespace> has no method 'clients' [closed]

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console.log(io.sockets.clients('test1234fgdgdfgdfg'));
It gives me error :
Object # has no method 'clients'
io.sockets.clients() can no longer be used after version Socket.IO version 1.0
Here's what you should use:
for (var clientId in io.sockets.adapter.rooms[roomId]) {
var clientSocket = io.sockets.connected[clientId];
}

Show results of multiple prompt boxes using Javascript [closed]

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How to make multiple prompt boxes and sort their input alphabetically and then show on screen using JavaScript ?
Thanks
Sequentially
if you are talking about the almost obsolete native javascrtipt function prompt() then:
var array=[];questions=['A?','B?','C?'],current=0;
function q(question){
array.push(prompt(question,'write here')+' question number:'+current);
if(current<questions.length){
next()
}else{
array.sort()// needs a proper sort function
alert(array.join("\n"));
};
}
function next(){
q(questions[current++]);
}
next();
Demo
http://jsfiddle.net/c7GnX/

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