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easy way to multiply a value to successive substrings in javascript

Good morning, sorry for my poor English.
I'm a neophyte and I'm trying to create a javascript program that, given a string in input, if it finds inside defined substrings it returns a value to each substring and returns the sum of the values ​​found as output. Everything ok here. But I'm finding it difficult to manage the case where in front of the substring that I'm looking for, there's for example "2x" which means that the value of the next substring (or of all subsequent substring) is to be multiplied for 2. How can I write in simple code this exception?
Example:
A1 = 1
M1 = 1
input description = A1-M1
output = 2
input descritpion = 2 x A1-M1
output = 4
Thanks in advance

For more comprehesion, you can find my code below:
let str_description = "2 x A1-M1";
var time_mont = [];
var time_cloa = [];
if(str_description.includes("A1")){
time_mont.push (0.62);
} else {
time_mont.push (0);
}
if(str_description.includes("M1")){
time_mont.push (0.6);
} else {
time_mont.push (0);
}
How can I manage "2 x " subtring?

Javascript loop either not running or not ending

I want to start with a large number in a variable, and while it is larger than another number, subtract 100 from the variable. I then want the loop to put the variable in the "demo" paragraph, which should end up being 89. Any help is appreciated.
var x = 789
while x > 100 {
x = x-100
}
document.getElementById("demo").innerHTML = x;
<p id="demo"></p>

Your while condition must be wrapped in parentheses.
var x = 789
while (x > 100) {
x = x-100
}
document.getElementById("demo").innerHTML = x;
<p id="demo"></p>

Using parenthesis in the while will fix your problem, just a small syntactical error
var x = 789
while (x > 100) {
x = x-100
}

try this,
function sub(x){
while(x > 100){
x = x-100
}
return x
}
document.getElementById("demo").innerHTML = sub(789);

Uhm - ok - I am really really really rusty at programming, but... you want to generate a predetermined static number and place that static number in a static html element programmatically? WTF man?
<p id="demo">89</p>
Is your solution.
No Javascript req'd. Unless you were hoping for a 'countdown' effect which:
1) Wont work with this code.
2) Wont work with corrected code.
3) Would work with a different methodology so fast you wont see it (you would have to introduce 'sleep' timers and so on).
It's been a bad day please don't take a picture.

Validate range inputs are not overlapping

I'm trying to validate that two range inputs who filter age do not go over one another. I can't find a way to have it done properly without the sliders behaving erratically, jumping from 0 to 50, and things like that.
I've tried different approaches (pure JS) with similar results:
if(input1.value >= input2.value || input2.value <= input1.value){
input1.value = toString(input2.value - 1);
input2.value = toString(input1.value + 1);
}
This one makes the sliders jump back to 50. I can't remember what else I've tried, but all do sort of the same thing. Either jump back to 50, or the minimumRange jump from 2 or 3 to 100.
I'd rather not use jQuery if at all possible
Here's the fiddle with the whole thing:
JSfiddle Validation and filters
Thank you!

This is how the function looks like now:
function filtroEdad(input1, input2) {
var edadMin = Number(input1.value);
var edadMax = Number(input2.value);
if(edadMin >= edadMax){
input1.value = (edadMax - 1).toString();
}
if(edadMax <= edadMin){
input2.value = (edadMin + 1).toString();
}
Thank you, #RaphaMex !!

Can't reproduce your issue in your fiddle, but I already see 2 issues in your code:
if input1.value is "50", then input1.value + 1 will be "501"
toString() should be called on numbers: 50.toString()
So your code should look like:
var minEdad = Number(input1.value),
maxEdad = Number(input2.value);
if(minEdad >= maxEdad) {
// Decide here what to do, for example
input1.value = (maxEdad - 1).toString();
}

Converting Base 10 to Base 2 in JavaScript Using A While Loop

I am extremely new to programming and have ran into a slight problem.
I am trying to convert any base 10 number to a base 2 number using JavaScript. In my code I am using "intDividend" to represent any integer between 1 and 1024 that the user inputs into the equation.
I believe I need to use a while loop instead of a for loop, however when I typed everything out, I was not able to get any answer to pop up into the text box I created on my webpage.
I can't figure out what is wrong and nothing I research seems to lead me in the right direction. This is the code that I have come up with.
function Base10ToBase2(intDividend) {
var fltQuotient=1.0
var intQuotient=1
var intRem=0
var fltDiff=0.0
var strB2=" "
while (intDividend != 0) {
fltQuotient=intDividend/2
intQuotient=parseInt(fltQuotient)
fltDiff=fltQuotient-intQuotient
if (fltDiff == 0) {
intRem=0
}
else {
intRem = 1
}
strB2 = intRem + strB2
intDividend=intQuotient
}
ConvertForm.BaseOutput.value=strB2;
}

number incrementing in Angular.js

I'm attempting to build an app that calculates sales metrics. I have run into an unusual problem in my build.
Part of the app allows users to increase/decrease a variable by 5% and then see how that will effect an overall metric. It also allows the user to see the percentage increase/decrease.
I have the functionality working roughly as intended, however if I enter a number lower than 20 into the input and then try in increase it with my incrementing function it only increments once and then stops.
If the number I enter into the input is 20 or greater it increments in the intended way.
Below is my angular code:
function controller ($scope) {
$scope.firstNumber = 0;
$scope.firstPercent = 0;
$scope.increase = function(id) {
var A = parseInt(id);
var B = A * 5/100;
var C = 0;
var C = A + B;
if (id === $scope.firstNumber) {
$scope.firstNumber = C;
$scope.firstPercent = $scope.firstPercent + 5;
}
};
$scope.decrease = function(id) {
var A = parseInt(id);
var B = A * 5/100;
var C = 0;
var C = A - B;
if (id === $scope.firstNumber) {
$scope.firstNumber = C;
$scope.firstPercent = $scope.firstPercent - 5;
}
};
I can't see anything wrong with my maths, my thinking is that perhaps I'm approaching angular in the wrong way. However I'm not sure.
I have put together a fiddle that shows the full code.
jsFiddle

I have updated the fiddle to use parseFloat. Seems like the numbers are incrementing now.
var A = parseFloat(id);
http://jsfiddle.net/kjDx7/1/
The reason why it was working with values above 20 was that it was just reading the part before decimals each time it tried to increase. So 20 became 21 and 22.05 and so on. As long the the value before decimal kept changing, it showed different (but incorrect) answers.
On the other hand, 10 became 10.5 which when parsed yielded 10. As you can see, this cycle continued endlessly.

The reason why you face the issue is because 5% of anything less than or equal to 20 is less than or equal to 1.
When you parseInt() the value, you always end up with the same number again.
Take 15 for example.
5% of 15 = 15.75
After parseInt(), you get the value 15 again.
You use the same value to increment / decrement each time.
Hence for values below 20, you don't get any changes.
As #Akash suggests, use parseFloat() instead - or why even do that when the value that you get is float anyway

I made a fork of your fiddle. I'm not completely sure what you want to achive.
Take a look at this fiddle.
$scope.increase = function() {
$scope.firstPercent = $scope.firstPercent + 5;
var A = $scope.firstNumber;
var B = (A / 100) * $scope.firstPercent;
var C = A + B;
$scope.firstNumberWithPercent = C;
};
update
After posting, i see that question is already answered. But is this what you really want? When you hit increase, it takes 5 % off of the number in the input field. That is ok, but when you hit decrease after that, it takes 5 % off the number in the same field. So your starting point is different.
100 + 5/100 = 105
105 - 5/105 = 99,75