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How to accept an input in the console from the user (JS)?

I tried to create a JavaScript program that outputs the binary format of an English letter on input. I had to put the value in the code. How can the value be entered in the console when the program runs?
function returnBinaryLetter(char) {
return ((/^[a-z]$/).test(char)) ? char.charCodeAt(0).toString(2).padStart(8, '0') : 'Sorry, that is not a letter.'
}
// Something like:
// const input = consoleInputFunction('Enter a number.');
// console.log(returnBinaryLetter(input.toLowerCase()));
EDIT 1: This is not for a webpage. This is a JS program which I will run using Node.js. I require a solution with just JS, not with some framework (if that is even possible, mentioning just to be specific).
EDIT 2: I have made the code better after suggestions in Endothermic Dragon's answer.

To directly answer your question, you would use prompt to get a user input in this case.
However, you don't need all of that code. Try this:
function returnBinaryLetter(char) {
if ((/^[a-z]$/).test(char)) {
return char.charCodeAt(0).toString(2).padStart(8, '0')
} else {
return 'Sorry, that is not a letter.'
}
}
var input = prompt('Enter letter to be converted to binary:').toLowerCase();
console.log(returnBinaryLetter(input))
While it may seem a bit intimidating, here's the whole thing broken down:
Ask for an input using prompt, and convert it to lowercase.
Pass the character to the function returnBinaryLetter, and log the output.
Now for the function returnBinaryLetter:
Check if it is a single lowercase letter, using some RegEx.
If it is, return binary. Otherwise, return an error with a description.
Hmm, but how does the binary conversion work?
First, take the character and get its character code.
Next, convert that code to binary.
Finally, pad the start so it is an 8-bit number. If it is not 8 digits, add on 0s at the beginning until it is.
Here, you can see that a more dynamic conversion looks much shorter, and cleaner as well, compared to manually entering about 28 lines of code.
Bonus:
Surprise, surprise! You can further shorten it. Using a ternary operator, you can skip the if-else statement.
function returnBinaryLetter(char) {
return ((/^[a-z]$/).test(char)) ? char.charCodeAt(0).toString(2).padStart(8, '0') : 'Sorry, that is not a letter.'
}
var input = prompt('Enter letter to be converted to binary:').toLowerCase();
console.log(returnBinaryLetter(input))
Now, it's a one-liner!
A ternary operator is usually used within variables when you want to assign its value based on a condition. The ternary operator first checks if the condition inside the brackets is true, and if it is, it returns the first statement (between ? and :), and if not, it returns the second statement (after the :). Pairing this with the return statement of a function, you get a one-liner function!
Feedback:
Since it seems that you are following CamelCase, I thought I would mention that function names should always start with a capital letter, along with each word after that also starting with a capital letter. Variables are different however - for variables, you do make the first letter lowercase, but make all the other words uppercase. In addition, the function name returnBinaryLetter might seem intuitive to you, but not for anyone looking at the code. A more intuitive name that exactly describes its function would be LowercaseLetterToBinary.

For NodeJS, You can use inquirer, which provides different kinds of prompts for the command line (such as text, list, checkbox etc).
Prerequistes:
Install it with npm install inquirer
Example
const { prompt } = require("inquirer");
async main() {
const binaryLetter = await prompt({
type: 'input',
name: 'letter',
message: `What's your name >>`
})
.then(answer => returnBinaryLetter(answer['letter']));
}
main();

Regex for js variable end with semicolon

I am trying to find and extract an assignment of a property of the product_image object from Javascript code, extracted with BeautifulSoup. I have tried following
re.findall(r"product_images\['top_lg'] = .*;", txt)
Unfortunately it does not extract anything from my text below.
product_images['top_lg'] = {
"tn": '//image.test.com/media/cache/04/0a/040a1e61f5edc387d8c8e40d3ea0e0ca.jpg',
"md": '//image.test.com/media/cache/b7/f3/b7f3cb1da267d7e8ac0412bdc522c862.jpg',
"lg": '//image.test.com/media/shape_images/011f7f24ae4cbbef191cff1a711df9e1_a3c9ca71b7d85d87085955f8d1c4bfc3_0_.jpg',
"alt": 'test ',
"data-zoomable": 'True',
"text_line": 'teest'
};
The scripts that I am parsing are taken from https://www.brilliantearth.com/Petite-Twisted-Vine-Diamond-Ring-White-Gold-BE1D54-3821855/

If, like me, you find regex flags confusing and hard to remember, use
"not semicolon" expressions instead of dot
re.findall(r"product_images\['top_lg'] = [^;]*;", txt)
Note. Otherwise you can add a flag as Thierry suggests, though you would need also add a 'non-gready modifier' ? after * to indicate that you are interested in the first semicolon rather that the last.

Javascript to input value into textbox instead of sendKeys() in Python

I cant use send_Keys() method to input values in the current website im working on.
So im trying to use javascript to input values.
i tried click() and clear() together with send_keys() before i decided to use javascript but to my disappointment, it didnt work.
i use the javascript code to input value below
driver.execute_script("document.getElementById('CustCd').setAttribute('value', 'J590')")
and it worked.
But currently my code is inside a loop and the value changes, how can i replace J590 with a variable that gets the value?
Here is the code that i tried
ccr_No = XLUtlis.readData(path, 'ccr', r, 1)
driver.execute_script("document.getElementById('CCRNo').value=ccr_No")
I know its wrong, any help would be appreciated. My Javascript is weak.
Just some side note if anybody would be able to solve my send_keys() error.
The function only takes in the first character that i send. For example, send_keys("J590") gives J, send_keys("J590-TE21") gives J-

First, the correct way to set the current value of an input is to assign to the value property. There is no attribute for the inputs current value (the value attribute is the input's default value, more here).
The rest is a special case of a general-purpose question: "How do I output a Python variable's value into JavaScript code?"
If the string you're outputting doesn't contain quotes or backslashes, you may get away with using a format string and outputting the value in quotes as Guy shows. (JavaScript has two kinds of quotes, ' and "; you only need to escape the kind you use around the value.) Those kinds of assumptions tend to break down, though; as soon as the string is Hi, I'm Joe that approach breaks.
In the general case, to ensure proper escaping and that all values are written correctly, you can use JSON:
import json
value = 'J590'
driver.execute_script(f"document.getElementById('CustCd').value = {json.dumps(value)};")
That outputs:
document.getElementById('CustCd').value = "J590";
Live Example
That way, you don't have to worry about quoting and escaping, it's all handled for you since valid JSON is valid JavaScript (thanks to a recent JavaScript specification fix; prior to that there was an edge case incompatibility that people almost never ran into).
It's also useful for numbers, or more complex things you might want to pass to hte JavaScript code. For instance:
import json
class Example:
foo = ""
bar = 0
def __init__(self, foo, bar):
self.foo = foo
self.bar = bar
value = Example("I'm a string with \"quotes\" in it.", 42)
print(f"const obj = {json.dumps(value.__dict__)};")
num = 42
print(f"const num = {json.dumps(num)};")
That outputs:
const obj = {"foo": "I'm a string with \"quotes\" in it.", "bar": 42};
const num = 42;
obj ends up being an object, because the initializer is a valid JavaScript object literal containing the data from the Example object. Similarly, num is a valid JavaScript number.
Live Example

You need to insert the variable as variable, not literal
value = 'J590'
driver.execute_script(f"document.getElementById('CustCd').setAttribute('value', '{value}')")

Using Javascript to input the values of a variable you can use the following solution:
ccr_No = XLUtlis.readData(path, 'ccr', r, 1)
# ccr_No = J590
driver.execute_script("document.getElementById('CCRNo').value='" + ccr_No + "';")
An example, to input the values of a variable within Search Box of Google Home Page:
Code Block:
driver.get("https://www.google.com/")
value = 'J590'
driver.execute_script("document.getElementsByName('q')[0].value='" + value + "';")
Browser Snapshot:
You can find a relevant discussion in Selenium : How to send variable character strings through executeScript()

Google Earth Engine ee.Number to integer

This is probably a simple question for people familiarized with the Code Editor of Google Earth Engine (https://code.earthengine.google.com/) or generally Javascript.
In my code, I need to use the size of an object for a boolean conditional (e.g. n>0). However, the output of .size() which I would store in n does not return a plain integer, but a ee.Number structure and I am not being able to transform it into an integer to properly evaluate the conditional.
Example with the structure ee.Number of Earth Engine:
var n=ee.Number(1)
print(n)
print(n.int())
print(n==1)
print(n===1)
print(n.int()==1)
print(n.int()===1)
print(n.int()== parseInt(1))
This outputs these evaluate as false, even when I try to tast the number structure into an int.
1
1
false
false
false
false
false
note:
print(typeof n)
returns an object (JSON):
object
Any help very much appreciated. Thanks

This is due to how GEE works. Processing steps are constructed locally as objects and then only evaluated by the server once another function requires it.
print is one of the functions that requires execution, this is why it shows as integer in your console.
You can force evaluation with .getInfo()... this however should be used with caution, because everything is pulled to the client side, which can be problematic with big objects.
So this works:
var n=ee.Number(1)
print(n)
print(n.getInfo()==1)
giving
1
true
This section of the documentation explains the background.

If the value of n indeed is JSON, try to parse it:
n = JSON.parse(n);
Then convert it into an integer:
n = parseInt(n);

how to evaluate a expression x+3x-4 by passing different values x to find the output

Ho to evaluate a scientifc expression (x+3x-4+sin x) by passing different values x to find the output
Please let me know the inbuilt function that can be used in java

Well I am not going give the whole code to you, but here are some hints:
The best way to eval an expression without any external API would be using running the expression as a javascript code and get the result.
Since you just can't do sin(0) + 6 in javascript, you will have to use RegEx to replace all function name to Math.(function name here) without affecting other function name. Such as sin(0) + asin(0)will be replaced to Math.sin(0) + Math.asin(0).
The changing value of x is very simple, just use RegEx to replace the x to a value without affecting other stuff, like x + exp(1) will be turned to 0 + Math.exp(1)
User can run javascript code with your calculator if using javascript, please be careful not to allow users to do so.
Similar question have been asked before, you might want to take a look about it: Evaluating a math expression given in string form

You’re looking for the sin method present in the Math library.
An example:
Math.sin(25); // Returns ‘sin’ of the value ‘25’