Filter Unique Characters
Given a string
myString as an input, write a JS program to find the unique characters from the myString.
Quick Tip
You can use the array method indexOf[].
- The input will be a single line containing a string myString
- The output should be a single line containing an array of unique characters
Sample Input 1
Was it a cat I saw?
Sample Output 1
[
'W', 'a', 's', ' ',
'i', 't', 'c', 'I',
'w', '?'
]
Sample Input 2
I did, did I?
Sample Output 2
[ 'I', ' ', 'd', 'i', ',', '?' ]
the out put should appeared same as shown in sample output's
/* This is a javaScript question, and I will also send the code with function that have to complete :-*/
"use strict";
process.stdin.resume[];
process.stdin.setEncoding["utf-8"];
let inputString = "";
let currentLine = 0;
process.stdin.on["data", [inputStdin] => {
inputString += inputStdin;
}];
process.stdin.on["end", [_] => {
inputString = inputString.trim[].split["\n"].map[[str] => str.trim[]];
main[];
}];
function readLine[] {
return inputString[currentLine++];
}
/* Please do not modify anything above this line */
function main[] {
const myString = readLine[];
/* complete thefunction */
}
Please help me.
Filter Unique Characters
Given a string
myString as an input, write a JS program to find the unique characters from the myString.
Quick Tip
You can use the array method indexOf[].
Input
- The input will be a single line containing a string myString
Output
- The output should be a single line containing an array of unique characters
Sample Input 1
Was it a cat I saw?
Sample Output 1
[
'W', 'a', 's', ' ',
'i', 't', 'c', 'I',
'w', '?'
]
Sample Input 2
I did, did I?
Sample Output 2
[ 'I', ' ', 'd', 'i', ',', '?' ]
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The purpose of this article is to find unique characters in a string using JavaScript.
Example:
Input: Geeksforgeeks Output: Geksforg Input: Geeksforgeeks is a great site for computer science Output: Geksforg Iaticmpun
To achieve this, we have the following approaches:
Approach 1: This is a naive approach to find the unique characters from a string. In this approach, we create a variable name uniq and we are iterating over the string using the for loop and at every iteration, we are checking if the uniq contains the character.
Javascript
function
findUnique[str]{
let uniq = "";
for[let i = 0; i < str.length; i++]{
if[uniq.includes[str[i]] === false]{
uniq += str[i]
}
}
return uniq;
}
console.log[findUnique["Geeksforgeeks"]]
console.log[findUnique["Geeksforgeeks Is a great site for computer science"]]
Output:
"Geksforg" "Geksforg Iaticmpun"
Approach 2: In this method, we use the set data structure. The set data structure contains only unique values, and we take the advantage of it. So to extract the unique values from string using Set we follow the steps below.
- Using the split[]method convert the string into an array.
- Create a Set using new Set[] and pass the converted array into it.
- Now convert the set into an array using spread operator e.g:[…set]
- And then join that array to make a string.
Javascript
function findUnique[str]{
str = str.split[""]
str = new Set[str];
str = [...str].join[""];
return str;
}
console.log[findUnique["Geeksforgeeks"]]
console.log[findUnique["Geeksforgeeks Is a great site for computer science"]]
Output:
"Geksforg" "Geksforg Iaticmpun"
Approach 3: In this approach first, we convert the string into an array using the spread operator e.g. […str] and then we apply the reduce method on that array.
Javascript
function findUnique[str]{
return
[...str].reduce[[acc, curr]=>{
return acc.includes[curr] ? acc : acc + curr;
}, ""]
}
console.log[findUnique["Geeksforgeeks"]]
console.log[findUnique["Geeksforgeeks Is a great site for computer science"]]
Output:
"Geksforg" "Geksforg Iaticmpun"
Approach-4: In this approach we will use a for-loop in order to iterate over the complete string and then by using the indexOf[] method we will check the index of each and every character [using charAt[] method] of the string which is either repeated or not repeated and then in an empty string [which we will declare initially] we will store all the unique characters.
Javascript
let uniqueCharacters = [stringg] => {
let unique_characters = "";
for [let i = 0; i < stringg.length; i++] {
if [unique_characters.indexOf[stringg.charAt[i]] < 0] {
unique_characters += stringg.charAt[i];
}
}
return unique_characters;
};
console.log[uniqueCharacters["Geeksforgeeks"]];
Output:
Geksforg