Print missing vowels in javascript

I need help to check what vowels, consonants and numbers are missing in a text given by the user.Is there a way to do that?

For example: The user inputs the string 'Hello, World 123', the only vowels are: e and o, and the consonants are h, l, d, w, the numbers are 123, the program has to determine which vowels, consonants and numbers are missing from the string, for example: the missing vowels are: a, i, u, the missing numbers are: 4, 5, 6, 7, 8, 9, and the missing consonants are: well, the rest of the consonants from the alphabet that are missing in the string

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About Javascript

Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.

Key Features

  • Open-source
  • Just-in-time compiled language
  • Embedded along with HTML and makes web pages alive
  • Originally named as LiveScript.
  • Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.

Syntax help

variable declaration

KeywordDescriptionScope
var Var is used to declare variables(old way of declaring variables) Function or global scope
let let is also used to declare variables(new way) Global or block Scope
const const is used to declare const values. Once the value is assigned, it can not be modified Global or block Scope

Backtick Strings

Interpolation

let greetings = `Hello ${name}`

Multi line Strings

const msg = `
hello
world!
`

Arrays

An array is a collection of items or values.

Syntax:

let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);

Example:

let mobiles = ["iPhone", "Samsung", "Pixel"];

// accessing an array
console.log(mobiles[0]);

// changing an array element
mobiles[3] = "Nokia";

Arrow functions

Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.

Syntax:

() => expression

Example:

const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
                                    .map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);

De-structuring

Arrays

let [firstName, lastName] = ['Foo', 'Bar']

Objects

let {firstName, lastName} = {
  firstName: 'Foo',
  lastName: 'Bar'
}

rest(...) operator

 const {
    title,
    firstName,
    lastName,
    ...rest
  } = record;

Spread(...) operator

//Object spread
const post = {
  ...options,
  type: "new"
}
//array spread
const users = [
  ...adminUsers,
  ...normalUsers
]

Functions

function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
  console.log(`Hello ${name}!`);
}
 
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar

Loops

1. If:

IF is used to execute a block of code based on a condition.

Syntax

if(condition){
    // code
}

2. If-Else:

Else part is used to execute the block of code when the condition fails.

Syntax

if(condition){
    // code
} else {
    // code
}

3. Switch:

Switch is used to replace nested If-Else statements.

Syntax

switch(condition){
    case 'value1' :
        //code
        [break;]
    case 'value2' :
        //code
        [break;]
    .......
    default :
        //code
        [break;]
}

4. For

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
//code  
} 

5. While

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
  // code 
}  

6. Do-While

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
  // code 
} while (condition); 

Classes

ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.

Syntax:

class className {
  constructor() { ... } //Mandatory Class method
  method1() { ... }
  method2() { ... }
  ...
}

Example:

class Mobile {
  constructor(model) {
    this.name = model;
  }
}

mbl = new Mobile("iPhone");

How do you print a vowel in Javascript?

Printing vowels in the string.
let s = "welcome".
let c, i..
for (i=0; i<=s. length-1; i++){.
c = s[i] // or s.charAt(i).
if (c=="a"|| c=="e" || c=="i" || c=="o".
c=="A"|| c=="E"|| c=="I" || c=="O" || c==.
log(c).

How do I find a missing vowel in a String?

To find the vowels in a given string, you need to compare every character in the given string with the vowel letters, which can be done through the charAt() and length() methods. charAt() : The charAt() function in Java is used to read characters at a particular index number.

How do you find the vowels in JS?

In the above program, the user is prompted to enter a string and that string is passed to the countVowel() function..
The regular expression (RegEx) pattern is used with the match() method to find the number of vowels in a string..
The pattern /[aeiou]/gi checks for all the vowels (case-insensitive) in a string..

How do you check if a String contains a vowel in Javascript?

To do this, we can use the includes method. The includes() method determines whether an array includes a certain value among its entries. It returns true if so, and false if not. Using includes , we'll check if our vowels array contains the character we're currently iterating over in our loop.