This is the test code that it's supposed to pass
function makeArray() {
const array = [];
const t = 10;
for (let i = 0; i < t; i++) {
array.push("I am a strange loop.");
}
return [array, t];
}
describe('loops', () => {
jsdom({
src: fs.readFileSync(path.resolve(__dirname, '..', 'loops.js'), 'utf-8'),
});
describe('forLoop(array)', () => {
it('adds `"I am ${i} strange loop${i === 0 ? \'\' : \'s\'}."` to an array 25 times', () => {
const [array, t] = makeArray();
const strangeArray = forLoop(array);
const testArray = strangeArray.slice(array.length);
const first = "I am 1 strange loop.";
const rest = "I am 24 strange loops.";
expect(strangeArray[11]).to.equal(first);
expect(strangeArray[34]).to.equal(rest);
expect(strangeArray.length).to.equal(t + 25);
});
});
});
this is my code to return the function to strangeArray what I am thinking is that 35 is the total number of members in the array and as the test pass requires me to have 'expect(strangeArray[11]).to.equal(first)' 11th value to be equal to my function return as
"I am 1 strange loop."
function forLoop(array) {
for (let i = 0; i < 35; i++) {
if (array[i] === "I am a strange loop.") {
return;
}
else {
array.push("I am ${i} strange loops.");
}
}
return [array,i];
}
Not sure what you mean exactly but I guess you just want the test to pass? The problem is that the first loop has 'loop' as singular and your indexes don't work either since they would start at 11. That's why your code doesn't work. You can just push to the original array.
function forLoop(array){
for(let i = 0; i < 25; i++){
array.push(`I am ${i} strange loop${i > 1 ? '' : 's'}.`)
}
return array
}
I've been struggling with the JUGGLING ASYNC task on learnyounode. As far as I can tell, I'm doing things almost right and it looks like the issue sits somewhere with the async compounded by myself trying to avoid bl or other modules. I did the previous task without another module and would like to continue this trend.
const http = require('http');
const url = process.argv[2];
let content = [];
let count = 0;
const arguments = process.argv;
let urlArray = arguments.filter(function pullUrls(element, index, array) {
return index >= 2;
});
function printResults() {
for (var i = 0; i < 3; i++) {
console.log(content[i]);
}
}
function httpGet(index) {
http.get(urlArray[index], function(response){
response.on('data', function(data){
newData = data.toString();
content[index] = content[index] + newData;
})
response.on('end', function(){
count++;
if (count === 3){
printResults();
}
})
})
}
for (var i = 0; i < 3; i++) {
httpGet(i);
}
Common output is very close to what is expected, but includes an undefined string at the beginning and I can't figure out why.
undefinedLets get some ute when we're going parma. Grab us a slab how it'll be bull bar. He's got a massive bushie where stands out like a pot.
undefinedShe'll be right mongrel heaps as cross as a hit the turps. Stands out like a booze also you little ripper flick. As stands out like ironman when lets throw a bikkie.
undefinedHe hasn't got a bounce with gutful of struth. Stands out like a aerial pingpong piece of piss built like a battler.
As you can see, it's finding the array 'undefined' first, which is true, but then appending onto it.
My best guess is that it's the content[index] = content[index] + newData; line somehow holding on to the undefined nature of let content = [] before content[i] is figured out. Now I've written it out and thought it through, this might be a simple JS problem I'm just overlooking or don't-know-that-I-don't-know.
Any help would be good.
Your getting right output, content[index] is undefined initially, you could do a undefined check, before concatenating newData. Here is complete code with changes.
const http = require('http');
const url = process.argv[2];
let content = [];
let count = 0;
const arguments = process.argv;
let urlArray = arguments.filter(function pullUrls(element, index, array) {
return index >= 2;
});
function printResults() {
for (var i = 0; i < 3; i++) {
console.log(content[i]);
}
}
function httpGet(index) {
http.get(urlArray[index], function(response){
response.on('data', function(data){
let newData = data.toString();
//check if undefined
if(typeof content[index] !== 'undefined'){
content[index] = content[index] + newData;
}else{
//add newData if undefined
content[index] = newData;
}
})
response.on('end', function(){
count++;
if (count === 3){
printResults();
}
})
})
}
for (var i = 0; i < 3; i++) {
httpGet(i);
}
I have the following code:
page.listSuccess = function (data, status, xhr) {
console.log(data);
if (data && data.items) {
var itemsQty = Math.ceil(data.items.length / 3);
for (var index = 0; index < itemsQty; index++) {
var itemData = {};
var itemClone = page.insertItemDOM(itemData);
if (index == 0) {
itemClone.addClass("active");
console.log(itemClone);
}
}
}
for (var index = 0; index < data.items.length; index++) {
var testimonialData = {}
testimonialData.title = data.items[index].title;
testimonialData.body = data.items[index].body;
testimonialData.starRating = data.items[index].starRating;
testimonialData.id = data.items[index].id;
page.insertTestimonialDOM(testimonialData);
}
}
At the moment, this code inserts all(5) my testimonials on one page. I need three per page, but I'm unsure as to how to go about it.
itemClone = a page on the carousel
testimonialData = a testimonial
insertItemDOM function =
page.insertItemDOM = function (itemData) {
var newItem = $($("#itemTemplate").html()).clone();
var targetLoc = $('.carousel-inner');
targetLoc.attr("data-target", "true");
targetLoc.append(newItem);
return newItem;
}
insertTestimonialDOM function =
page.insertTestimonialDOM = function (testimonialData) {
var newTemplate = $($("#testimonialTemplate").html()).clone();
newTemplate.find('.title').html(testimonialData.title);
newTemplate.find('.body').html(testimonialData.body);
newTemplate.find('.starRating').html(testimonialData.starRating);
var targetLoc = $('.carousel-inner');
targetLoc.attr("data-target", "true");
targetLoc.append(newTemplate);
}
Let me explain the concept for you. What you want is after every 3 loop execution the loop shall work it again and enter details in a new page.
Let's make two function.
var index;
var theinitial = function(z)
{
index = z
var counter = 1;
insertionfunction();
}
var insertionfunction = function()
{
for (var zzz = index; zzz < data.items.length; zzz++) {
if (counter <= 3)
{
itemClone = page.insertItemDOM(itemData);
}
else
{
theinitial(zzz);
}
}
Here the first request you make to 'theinitial function' with 1 as value of z then the function will call the insertion function and now the loop will run for 3 times then after three times the value of zzz is used to call the initial function again. Now your index is 4, hence the loop will start from 4th element and run for 3 more times as counter is reinitialized to 1.
I don't really know how your page insertion thing works therefore I am explaining the concept to you.
My Requirement:
I want to get the list of values using for loops. In for loop one iteration completed one time then the callback will send that list of values(array).
Once the first iteration completed second time loop value should be get incremented value.
For example : 5 values
after 5th iteration then loop is over. then second time loop should start with '0' but here it's starting with last incremented value. please help me to achieve this.
Below code is working fine for the first time.
Callback function:
$inventoryManagement.getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId(objectId,attributeId, function(objectAttributeBlockElement) {
//$scope.val = myOwnJ;
console.log(objectAttributeBlockElement);
});
Function:
var myOwnJ = 0;
// Getting ObjectId And AttributeId Using CellId For Normal Controls
var getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId = function(objectId,attributeId, callback) {
var objectAttributeBlockElement = [];// one array
try {
// iterate over the objectAttributes
for (var i = 0; i < pageObject.objects.length; i++) {
if (pageObject.objects[i].id == objectId) {
var name = "";
var labelName = "";
var dataTypeId = "";
for (;myOwnJ < pageObject.objects[i].objectAttribute.length;) {
name = pageObject.objects[i].objectAttribute[myOwnJ].name;// got the current label name
labelName = pageObject.objects[i].objectAttribute[myOwnJ].labelName;// got the current name
dataTypeId = pageObject.objects[i].objectAttribute[myOwnJ].dataTypeId;// got the current dataTypeId
objectAttributeBlockElement.push(name,labelName,dataTypeId);
callback(objectAttributeBlockElement, myOwnJ++);
return;
}
}
}
throw {
message: "objectId not found: " + objectId
};
} catch (e) {
console.log(e.message + " in getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId");
}
};
You could pass j as an additional function parameter, such as
var getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId = function(objectId, attributeId, j, callback) {
so it won't be a local variable. Then, instead of declaring it locally, use the following:
for (j = ((j === null) ? 0 : j); j < pageObject.objects[i].objectAttribute.length; j++) {
That way, if you call your function with j, you'll get it incremented after each call.
Another approach, which I won't recommend, would be making j a global variable by declaring it ouside your function instead of passing it as a parameter. That way you don't have to modify your function declaration at all. If you're up to that, I strongly suggest modifying the variable name cause j would be too generic for a global scope variable and it will cause trouble sooner or later: use something like myOwnJ and you'll be fine.
EDIT: Full source code (as requested by the OP):
var myOwnJ = 0;
// Getting ObjectId And AttributeId Using CellId For Normal Controls
var getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId = function(objectId,attributeId, callback) {
var objectAttributeBlockElement = [];// one array
try {
// iterate over the objectAttributes
for (var i = 0; i < pageObject.objects.length; i++) {
if (pageObject.objects[i].id == objectId) {
var name = "";
var labelName = "";
var dataTypeId = "";
if(myOwnJ < pageObject.objects[i].objectAttribute.length) {
name = pageObject.objects[i].objectAttribute[myOwnJ].name;// got the current label name
labelName = pageObject.objects[i].objectAttribute[myOwnJ].labelName;// got the current name
dataTypeId = pageObject.objects[i].objectAttribute[myOwnJ].dataTypeId;// got the current dataTypeId
objectAttributeBlockElement.push(name,labelName,dataTypeId);
callback(objectAttributeBlockElement, myOwnJ++);
return;
}
else {
myOwnJ = 0;
}
}
}
throw {
message: "objectId not found: " + objectId
};
} catch (e) {
console.log(e.message + " in getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId");
}
};
What you are looking for is a global variable for 'j'. Although this is discouraged to be used.
var j=0;
var getObjectNameAndAttributeAndDataTypeIdUsingObjectAndAttributeId =
function(objectId, attributeId, callback) {
//do your stuff
//increment j
j++;
}
I'd like to use console.log() to log messages without appending a new line after each call to console.log(). Is this possible?
No, it's not possible. You'll have to keep a string and concatenate if you want it all in one line, or put your output elsewhere (say, another window).
In NodeJS you can use process.stdout.write and you can add '\n' if you want.
console.log(msg) is equivalent to process.stdout.write(msg + '\n').
Yes, it's possible (check out the demo below) -- by implementing your own virtual console on top of the native browser console, then syncing it to the real one.
This is much easier than it sounds:
maintain a display buffer (e.g. an array of strings representing one line each)
call console.clear() before writing to erase any previous contents
call console.log() (or warn, error, etc) to fill the console with the contents from your display buffer
Actually, I've been doing this for some time now. A short, rudimentary implementation of the idea would be something along the following lines, but still capable of animating the console contents:
// =================================================
// Rudimentary implementation of a virtual console.
// =================================================
var virtualConsole = {
lines: [],
currentLine: 0,
log: function (msg, appendToCurrentLine) {
if (!appendToCurrentLine) virtualConsole.currentLine++;
if (appendToCurrentLine && virtualConsole.lines[virtualConsole.currentLine]) {
virtualConsole.lines[virtualConsole.currentLine] += msg;
} else {
virtualConsole.lines[virtualConsole.currentLine] = msg;
}
console.clear();
virtualConsole.lines.forEach(function (line) {
console.log(line);
});
},
clear: function () {
console.clear();
virtualConsole.currentLine = 0;
}
}
// =================================================
// Little demo to demonstrate how it looks.
// =================================================
// Write an initial console entry.
virtualConsole.log("Loading");
// Append to last line a few times.
var loadIndicatorInterval = setInterval(function () {
virtualConsole.log(".", true); // <- Append.
}, 500);
// Write a new line.
setTimeout(function () {
clearInterval(loadIndicatorInterval);
virtualConsole.log("Finished."); // <- New line.
}, 8000);
It sure has its drawbacks when mixing with direct console interaction, and can definitely look ugly -- but it certainly has its valid uses, which you couldn't achieve without it.
You can put as many things in arguments as you'd like:
console.log('hi','these','words','will','be','separated','by','spaces',window,document)
You'll get all that output on one line with the object references inline and you can then drop down their inspectors from there.
The short answer is no.
But
If your use-case involves attempting to log perpetually changing data while avoiding console-bloat, then one way to achieve this (in certain browsers) would be to use console.clear() before each output.
function writeSingleLine (msg) {
console.clear();
console.log(msg);
}
writeSingleLine('this');
setTimeout( function () { writeSingleLine('is'); }, 1000);
setTimeout( function () { writeSingleLine('a'); }, 2000);
setTimeout( function () { writeSingleLine('hack'); }, 3000);
Note that this would probably break any other logging functionality that was taking place within your application.
Disclaimer: I would class this as a hack.
collect your output in an array and then use join function with a preferred separator
function echo(name, num){
var ar= [];
for(var i =0;i<num;i++){
ar.push(name);
}
console.log(ar.join(', '));
}
echo("apple",3)
check also Array.prototype.join() for mode details
var elements = ['Fire', 'Wind', 'Rain'];
console.log(elements.join());
// expected output: Fire,Wind,Rain
console.log(elements.join(''));
// expected output: FireWindRain
console.log(elements.join('-'));
// expected output: Fire-Wind-Rain
If your only purpose to stop printing on many lines, One way is to group the values if you don't want them to fill your complete console
P.S.:- See you browser console for output
let arr = new Array(10).fill(0)
console.groupCollapsed('index')
arr.forEach((val,index) => {
console.log(index)
})
console.groupEnd()
console.group
console.groupCollapsed
Something about #shennan idea:
function init(poolSize) {
var pool = [];
console._log = console.log;
console.log = function log() {
pool.push(arguments);
while (pool.length > poolSize) pool.shift();
draw();
}
console.toLast = function toLast() {
while (pool.length > poolSize) pool.shift();
var last = pool.pop() || [];
for (var a = 0; a < arguments.length; a++) {
last[last.length++] = arguments[a];
}
pool.push(last);
draw();
}
function draw() {
console.clear();
for(var i = 0; i < pool.length; i++)
console._log.apply(console, pool[i]);
}
}
function restore() {
console.log = console._log;
delete console._log;
delete console.toLast;
}
init(3);
console.log(1);
console.log(2);
console.log(3);
console.log(4); // 1 will disappeared here
console.toLast(5); // 5 will go to row with 4
restore();
A simple solution using buffered output. Works with deno and should work with node.js. (built for porting pascal console programs to javascript)
const write = (function(){
let buffer = '';
return function (text='\n') {
buffer += text;
let chunks = buffer.split('\n');
buffer = chunks.pop();
for (let chunk of chunks)
{console.log(chunk);}
}
})();
function writeln(text) { write(text + '\n'); }
To flush the buffer, you should call write() at the end of program.
If you mix this with console.log calls, you may get garbage output.
if you want for example console log array elements without a newline you can do like this
const arr = [1,2,3,4,5];
Array.prototype.log = (sep='') => {
let res = '';
for(let j=0; j<this.lengthl j++){
res += this[j];
res += sep;
}
console.log(res);
}
// console loging
arr.log(sep=' '); // result is: 1 2 3 4 5
Useful for debugging or learning what long chained maps are actually doing.
let myConsole = (function(){
let the_log_buffer=[[]], the_count=0, the_single_line=false;
const THE_CONSOLE=console, LINE_DIVIDER=' ~ ', ONE_LINE='ONE_LINE',
PARAMETER_SEPARATOR= ', ', NEW_LINE = Symbol();
const start = (line_type='NOT_ONE_LINE') => {
the_log_buffer=[[]];
the_count=0;
the_single_line = line_type == ONE_LINE;
console = myConsole;
}
const stop = () => {
isNewline();
console = THE_CONSOLE;
};
const isNewline = a_param => {
if (the_single_line && a_param==NEW_LINE) return;
const buffer_parts = the_log_buffer.map(one_set=> one_set.join(PARAMETER_SEPARATOR))
const buffer_line = buffer_parts.join(LINE_DIVIDER);
if (the_single_line) {
THE_CONSOLE.clear();
}
THE_CONSOLE.log( buffer_line );
the_log_buffer = [[]];
the_count=0;
}
const anObject = an_object => {
if (an_object instanceof Error){
const error_props = [...Object.getOwnPropertyNames(an_object)];
error_props.map( error_key => an_object['_' + error_key] = an_object[error_key] );
}
the_log_buffer[the_count].push(JSON.stringify(an_object));
}
const aScalar = a_scalar => {
if (typeof a_scalar === 'string' && !isNaN(a_scalar)) {
the_log_buffer[the_count].push("'" + a_scalar + "'");
} else {
the_log_buffer[the_count].push(a_scalar);
}
}
const notNewline = a_param => typeof a_param === 'object' ? anObject(a_param):aScalar(a_param);
const checkNewline = a_param => a_param == NEW_LINE ? isNewline(a_param) : notNewline(a_param);
const log = (...parameters_list) => {
the_log_buffer[the_count]=[];
parameters_list.map( checkNewline );
if (the_single_line){
isNewline(undefined);
}else{
const last_log = parameters_list.pop();
if (last_log !== NEW_LINE){
the_count++;
}
}
}
return Object.assign({}, console, {start, stop, log, ONE_LINE, NEW_LINE});
})();
function showConcatLog(){
myConsole.stop();
myConsole.start();
console.log('a');
console.log('bb');
console.dir({i:'not', j:'affected', k:'but not in step'})
console.log('ccc');
console.log([1,2,3,4,5,'6'], {x:8, y:'9'});
console.log("dddd", 1, '2', 3, myConsole.NEW_LINE);
console.log("z", myConsole.NEW_LINE, 8, '7');
console.log(new Error("error test"));
myConsole.stop();
}
myConsole.start(myConsole.ONE_LINE);
var stop_callback = 5;
function myCallback(){
console.log(stop_callback, 'Date.now()', myConsole.NEW_LINE, Date.now());
stop_callback--;
if (stop_callback>0){
window.setTimeout(myCallback, 1000);
}else{
showConcatLog();
}
}
window.setTimeout(myCallback, 1000);
You can use a spread operator to display output in the single line. The new feature of javascript ES6. see below example
for(let i = 1; i<=10; i++){
let arrData = [];
for(let j = 1; j<= 10; j++){
arrData.push(j+"X"+i+"="+(j*i));
}
console.log(...arrData);
}
That will print 1 to 10 table in single line.
// Source code for printing 2d array
window.onload = function () {
var A = [[1, 2], [3, 4]];
Print(A);
}
function Print(A) {
var rows = A.length;
var cols = A[0].length;
var line = "";
for (var r = 0; r < rows; r++) {
line = "";
for (var c = 0; c < cols; c++) {
line += A[r][c] + " ";
}
console.log(line);
}
}