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How to calculate the correct characters the user typed [closed]

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anyone know the reference for a case like this?
the user must type the word: "learn" -> total character 5
while the user types instead: "l3arn"
well I want to count the right word only, so the result 4
from google not yet find a solution, maybe someone knows the keyword/reference for the problem.
I want to implement it in javascript

You want to calculate the number of characters in the correct position?
In that case, it's a simple solution.
Javascript example:
function countCorrectCharacters(expectedString, string) {
var count = 0;
var l = Math.min(expectedString.length, string.length);
for (var i = 0; i < l; ++i) {
if (expectedString[i] === string[i]) {
++count;
}
}
return count;
}

var str = "learn";
var userInput = "l3arn";
var userInputArray = userInput.split('');
var counter = 0;
for(var i = 0; i< "l3arn".lenth(); i++){
if(str.indexOf(userInputArray[i]) !== -1) counter++;
}

If I understand correctly you want to count the number of letters in a string? Use this:
function getNumberOfLetters(string) {
let match = string.match(/[A-Za-z]/g);
return (match && match.length) || 0;
}
console.log(getNumberOfLetters("learn")); // 5
console.log(getNumberOfLetters("l3arn")); // 4
console.log(getNumberOfLetters("12345")); // 0

Javascript - Passing from a DOM element to array [closed]

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Hello and thank you for your time.
Here is the code :
<script>
var names = document.getElementsByClassName('xx');
var ar = [];
for (var i = 0, c = names.length ; i < c ; i++) {
ar[i] = names[i].innerHTML;
alert(ar[i]);// the results are : undefined
}
</script>`
I've tried to use the method tostring, or to push the results into the array but without success.
Thanks

Your main issue seems to be fixed. Make sure the DOM has been loaded before you try to run your code, and there is no need for two variables in your loop. Simplify it like below:
window.onload = function () {
var names = document.getElementsByClassName('xx');
var ar = [];
for (var i = 0 ; i < names.length ; i++) {
ar[i] = names[i].innerHTML;
alert(ar[i]);
}
};
Fiddle

ar.length equals 0, because you just declare the array, but dont put anything into it. I think what you wanted to do is the following:
var names = document.getElementsByClassName('xx');
var ar = [];
for (var i = 0 ; i < names.length ; i++) {
ar[i] = names[i].innerHTML;
alert(ar[i]);
}

Why doesn't my javascript regexp work with array items? [closed]

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var x = new Array('1','2','3');
var y = new Array('a','b','c');
var iLen = x.length;
var s = 'abcdefgabcdefg';
for (var i=0;i<iLen;i++) {
var re = new RegExp(x[i],'g');
s = s.replace(y[i], re);
}
alert(s);
I want the result to be 123defg123defg.
Instead, I get /1/g/2/g/3/gdefgabcdefg.

You are doing it wrong, because you want to replace occurrences of array y to occurrences of x globally, you should say like
for (var i=0;i<iLen;i++) {
var re = new RegExp(y[i],'g'); //this is regexp for global y[i]
s = s.replace(re, x[i]); //replace all occurrences of y[i] with x[i]
}

using a var and a string to find a folder [closed]

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to say some space and repetition I'm trying to use a var n to store a common location for a folder but also want to later combine a image name.
example.
var n="/me/work/air/image/";
var get_images = ["'+n+'" "1.jpg"",n+ "2.jpg" ]
I'm simply just trying to include var n with the string "1.jpg"
so the result would be
"/me/work/air/image/1.jpg","/me/work/air/image/2.jpg"

Are you looking for something like this?
var n= "/me/work/air/image/";
var get_images = [];
for (var i=0; i < 30; i++) {
get_images.push(n + "" + i + ".jpg");
}

this while loop is prolly the fastest one... length is the number of images ..
var path='/me/work/air/image/',length=10,array=[];
while(length--){
array[length]=path+length+'.jpg'
}
array.shift() // if you start from 1
or just create a function where i is the number of the image
function getImg(i){
return '/me/work/air/image/'+i+'.jpg'
}
use
var image1=getImg(1);
or
'<img src="'+getImg(1)+'">'
it also all depends inwhich contest you wanna reuse the image later and how often

Try this
var n= "/me/work/air/image/";
var get_images = {
first: n + "1.jpg",
second: n+ "2.jpg"
};
Now you can use get_Images["first"] or get_Images.first to get the data of each properties of JSON object.

Undefined var error in an array iteration on a page using mootools [closed]

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var makeModelYearSelect = document.getElementById("<%= MakeModelYearFilterLB.ClientID %>").control;
var selectedMakeModelYearItems = makeModelYearSelect.get_checkedItems();
var selectedMakeModelYearItemIds = [];
for (var index = 0; index < selectedMakeModelYearItems.length; index++) {
selectedMakeModelYearItemIds.push(selectedMakeModelYearItem[index].get_value(index));
}
Why is this firing back an error of Microsoft JScript runtime error: 'selectedMakeModelYearItem' is undefined?
Mootools won't let me use a simple for...in for iterations.
I've looked at it 6 ways to Sunday so what the heck am I missing?

Because selectedMakeModelYearItem is undefined.
selectedMakeModelYearItems isn't, though.

Maybe you try to call this code berofe page is loaded. In this case select tag that you try to access don't rendered and cannot be accessed from JavaScript. You can try something like
window.addEventListener("load",
(function() {
return function setMakeModelYearFilter() {
var makeModelYearSelect = document.getElementById("<%= MakeModelYearFilterLB.ClientID %>").control;
var selectedMakeModelYearItems = makeModelYearSelect.get_checkedItems();
var selectedMakeModelYearItemIds = [];
for (var index = 0; index < selectedMakeModelYearItems.length; index++) {
selectedMakeModelYearItemIds.push(selectedMakeModelYearItem[index].get_value(index));
}
window.removeEventListener('load', setMakeModelYearFilter, false);
}})()
, false);