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How to add spaces to for loop output in javascript? [closed]

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I want to add one space in between each outcome in this for loop,
for (var i = -52; i <= 1066; i++) {
document.write(i)
}

You can add to do it
for (var i = -52; i <= 1066; i++) {
document.write(i+" ");
}
Or just add to space in the write
for (var i = -52; i <= 1066; i++) {
document.write(i+" ");
}

this should help you out.
for (var i = -52; i <= 1066; i++) {
document.write(' ' + i)
}
or
for (var i = -52; i <= 1066; i++) {
document.write(' ' + i)
}

Browsers are designed to ignore whitespace such as spaces, typing in multiple ' ' (spaces) will be reduced to a single space. If you're looking to add multiple spaces in Javascript the easiest way is to use &nbsp. Such tags are called entities and numerous characters can be printed using entities. More can be found here
for(var i = 0;i < n;i++)
{
document.write("&nbsp")
}

for (var i = 52; i <= 1066; i++) {
document.write(i+'\t') }

Try this:
let result = [];
for (let i = -52; i <= 1066; i++) {
result.push(i);
}
document.write(result.join(" "));
Suggestion: avoid using document.write at best, especially in a big for loop.

Javascript word counter [closed]

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I wanted to make a basic word counter based on the amount of whitespaces in a sentence, but for some reason it doesn't work.
function countWords(str) {
if (typeof str == "string" && str.length > 0) {
var counter = 1;
for (var i; i < str.length; i++) {
if (str[i] === " ") {
counter += 1;
}
}
return counter;
} else {
throw Error("You must input a string.");
}
}
console.log(countWords("hello World"));
This throws 1 instead of 2.

You shouldn't use a loop for this. You would rather just split the string by space and take the resulting array's length
let countWords = str => str.split(' ').length;
console.log(countWords("foo bar"));

Initialize i to zero.
Replace for (var i; with for (var i=0;

You must initilize the counter inside the for, like var i = 0; here is your code
function countWords(str) {
if (typeof str=="string" && str.length>0) {
var counter=1;
for (var i;i<str.length;i++) {
if (str[i]===" ") {
counter+=1;
}
}
return counter;
}
else {
throw Error("You must input a string.");
}
}
countWords("hello World");
Or you can count words with str.split(" ").length

Your for loop was wrong
function countWords(str) {
if (typeof str=="string" && str.length>0) {
var counter=1;
for (var i = 0;i<str.length;i++) {
if (str[i]===" ") {
counter+=1;
}
}
return counter;
}
else {
throw Error("You must input a string.");
}
}
var str = "hello World this is me";
console.log(countWords(str));

Longest Even word [closed]

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I need to find the longest even word from a sentence.
I've tried this code for finding the largest word.
But I need the even word.
Can anyone please help me?
function FindlongestWord(input) {
var arrWords = input.split(' ');
var wordlength = 0;
var word = '';
arrWords.forEach(function(wrd) {
if (wordlength < wrd.length) {
wordlength = wrd.length;
word = wrd;
}
});
return word;
}

Using modulus operator in the if statement
arrWords.forEach(function(wrd) {
if (wordlength < wrd.length && wrd.length % 2 == 0) {
wordlength = wrd.length;
word = wrd;
}
});

function FindlongestWord(input) {
var arrWords = input.split(' ');
var wordlength = 0;
var word = '';
arrWords.forEach(function(wrd) {
if (wordlength < wrd.length && !wrd.length%2) {
wordlength = wrd.length;
word = wrd;
}
});
return word;
}

Alternative solution.
const longestWord = (str) => str.split(' ').filter(v => !(v.length % 2))
.sort((a,b) => b.length - a.length)[0];
console.log(longestWord('hi there hello four longer longestt'));

Javascript for loop hashtag [closed]

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Hey I am trying to print out #, by increasing the amount of # for each line. like this:
#
##
###
####
#####
Here is the for loop that I have tried to work this out with:
var printout = "";
for(var i=0;i<5;i++) {
printout+= "#" + " <br>";

You can add one more variable for incrementing #
var printout = "", a = '';
for (var i = 0; i < 5; i++) {
printout += (a += '#') + " <br>";
}
document.body.innerHTML += printout;

If you're just trying to print them:
for (var i=0; i < 5; i++) {
console.log("#".repeat(i+1))
}

Check this out, output will be in HTML.
var printout = "";
for(var i=0;i<5;i++) {
for(var j=0; j<=i; j++)
{
printout += "#";
}
printout += " <br>";
}
var pvar = document.getElementById("check");
pvar.innerHTML = printout;
<p id="check">
</p>

Using a variable inside the Math.random function [closed]

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I am working on a piece of code which make an array full of numbers with the amount of numbers i want, but instead of this beeing static with 16 numbers i tried to change 16 to a variable but the math.floor/randome cant read it it only spits out Not a number wierdly enough.
EDIT: with 16 put in it works, but i cant use a variable (declared in the same function ofc)after i console.log the variable it shows it as a number but then my browser freezes
Is There anyone who knows how to change this
while(arr.length < pictures.length) {
var randomenumber = Math.floor((Math.random()* 16));
if(arr.indexOf(randomenumber) > -1) {
continue;
}
arr[arr.length] = randomenumber;
}
//cheat sheet
for(var i = 0; i < arr.length ; i++) {
document.write(arr[i]);
document.write("<br/>");
}

I don't see any issues if you use var length = 16 and Math.floor((Math.random() * length)).
Working snippet:
var arr = [], length = 16;
while(arr.length < length) {
var randomenumber = Math.floor((Math.random() * length));
if(arr.indexOf(randomenumber) > -1) {
continue;
}
arr[arr.length] = randomenumber;
}
//cheat sheet
for(var i = 0; i < arr.length ; i++) {
document.write(arr[i]);
document.write("<br/>");
}

You will need to parse it in integer using parseInt.
var num = 16;
var randomenumber = Math.floor((Math.random() * parseInt(num)));