Index characters from an array based on user input

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I have an array of the entire alphabet from a to z. I also have an input field. I want to be able to find the index of each character from the input field in the alphabet array but my function doesn't work. I've tried storing the text from the input field into an array, and I've tried using a named function for it as well but neither worked.

<input type="text" id="plaintext" placeholder="Plaintext">
<div id="start"><div id="start_text">Start</div></div>
let plaintext = document.getElementById("plaintext");
let alph = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
let startB = document.getElementById("start");
let plainParser = [];

startB.addEventListener('click', () => {
    for(let i=0; i < alph.length; i++){
        console.log(alph.findIndex( () => plainParser.push(plaintext.value.split(''))));

I want to … find the index of each character from the input field in the alphabet array

Then instead of looping from 0 to 25:

for(let i=0; i < alph.length; i++){

you should loop over every character from the input:

for (let c of plaintext.value) {

I want to … find the index of each character from the input field in the alphabet array

You have the character, so find the index:



let plaintext = document.getElementById("plaintext");
let alph = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
let startB = document.getElementById("start");

startB.addEventListener('click', () => {
    for (let c of plaintext.value) {

C getline char array, To accept a string or a line of input stream as input, we have an in-built function Get the index of the column having the given label. istream& getline (char* s, ( C++) Trying to use getline() to accept input from user into a character array, but� Okay here is the problem I am having.. I am trying to make an array based on a user input.. That means the size of the array is unknown.. Here is what the program should look like. How many expierments do you want to do? Insert user input here expierment 1: expierment 2: expierment 3: And so on..

A shortcut without needing the array is use the charCode of each character.

a starts at 97

const str = 'abc';

for(let s of str){
  console.log(s.charCodeAt(0) - 97);  

How to save user input inside an array in Java, I personally like using buffered reader to take user inputs instead of using scanner class (Nothing bad in using Scanner What is the difference between String Array and Character Array? How do I handle array of out index error in Java? Read User Input into Array In C++ Example Program Enter Value for Position 0 : 900 Enter Value for Position 1 : 200 Enter Value for Position 2 : 800 Enter Value for Position 3 : 700 Enter Value for Position 4 : 750 Enter Value for Position 5 : 901 Enter Value for Position 6 : 800 Enter Value for Position 7 : 820 Enter Value for Position 8 : 980

Here's a slightly refactored version of what I think you are looking for:

const alphabet = 'abcdefghijklmnopqrstuvwxyz';

const result = document.querySelector(".result");
const plaintext = document.getElementById("plaintext");
const startB = document.querySelector(".start");

startB.addEventListener('click', () => {
	const source = plaintext.value;
  result.innerText = '';
  if (!source) return;
  const indices = [];
  for (let char of source) {
  result.innerText = indices.join(', ');
<input type="text" id="plaintext" placeholder="Plaintext">
<button class="start">Start</button>

<div class="result" style="font-family: monospace;"></div>

C++ strings: taking string input, pointer to string, passing to function, We know that string is a collection of characters. Look at the character at the 3rd index. Now let's see how to input string from the user with an example. " Sam"; char *p; p = name; /* for string, only this declaration will store its base address� After conversion to characters, the input arrays become rows in C. The char function pads rows with blank spaces as needed. If any input array is an empty character array, then the corresponding row in C is a row of blank spaces.

Here's a demo that fires on keyup event and converts user input to Unicode on every keystroke. There is a comment with alternate code if you want to have user input converted to 0 to 25 index instead.

const az = document.forms[0];

const intArray = (node) => {
  return JSON.parse(JSON.stringify(`[${node.textContent}]`));

const dataKey = event => {
  const txt =;
  const view = event.currentTarget.elements.view;
  /* swap lines if you want indexes 0 to 25
  view.textContent += (event.which - 65) + ', ';
  view.textContent += event.which + ', ';

az.onkeyup = event => {
  let result = intArray(az.elements.view);
:root {
  font: 400 16px/1.3 Consolas

output {
  display: block;
  font: inherit

fieldset {
  width: fit-content;

#text {
  display: block;
  width: 98%;
<form id='az'>
    <legend>Unicode UTF-16</legend>
    <textarea id="text"></textarea>
    <output id='view'></output>

Chapter 7: Arrays, Like Strings, arrays use zero-based indexing, that is, array indexes start with 0. inputs the length of a int array from the user and assigns 1 at index 0, assigns 2 at index 1, Suppose we want a method that converts a String into a char array. Result calculated from input, returned as an array. The type and dimensions of the array depend upon the response to the prompt. str — Exact text of input character vector

Java program for linear search - Example, Scanner; class LinearSearchExample { public static void main(String args[]) { int counter, num, item, array[]; //To capture user input Scanner input = new� I'm trying to create a program that prompts the user to put in several different numbers. I'd like to put those numbers into an array for easy use. To save me time on coding, I want to loop the request for user input. Would I use a for loop and use the subscript in the array to make changes as needed? Please help.

Arrays and Strings, To take C-style string as an input you can simple use scanf() with '%s' format In C, strings are just character arrays which end with a null character. class type, their characters can still be referenced using a 0 based indexing, just like C if we declare a 2d string and we ask the user to enter a string , and asks us to enter � The simplest type of input and output in C programming takes place at the character level: One character goes in; one character comes out. Of course, getting to that point involves a wee bit of programming. Input and output devices in C programming The C language was born with the Unix operating system. As such, […]

Arrays and References | Think Java, For example, there are more than 3 million characters in War and Peace; to process One of the most common ways to index an array is with a loop variable . All arrays have a built-in constant, length , that stores the number of elements. that always behaves differently, even when run multiple times with the same input. Passing 2D array as an aurgument in a function ; Problem with Dynamic Memory allocation ; Reading 2 files ; Capture user input into array ; user input into array string ; pascal keyboard numbers ; passing char user input to a function ; User input data into array ; Copy worksheet to another workbook and rename it ; User input with char array