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Commit 7fc4417

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Strings Questions
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‎#6 - Strings/0-strings-basics.js‎

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// Strings in Javascript
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// Creating Strings
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const string = new String("Subscribe to RoadsideCoder!");
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// using double quotes
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const doubleQuote = "Subscribe to RoadsideCoder!";
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// using single quotes
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const singleQuote = 'RoadsideCoder!';
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// using backticks
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const backticks = `
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Subscribe to RoadsideCoder!
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Like this Video
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Share this video
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`;
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// Template Literals
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const templateLiteral = `Subscribe to ${singleQuote}!`;
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// Tagged Literals
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console.log`hello ${"world"} how are ${"you"}`
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// Tagged Literals Example function
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function test (string, youtubeChannel, person) {
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console.log(string,youtubeChannel, person)
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return;
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}
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const channel = "RoadsideCoder"
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const name = "Piyush"
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test`Subscribe to ${channel} run by ${name}`
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// Strings length
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const str = "Subscribe to RoadsideCoder!";
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str.length
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// Accessing Characters
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str[3]
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str.charAt(3)
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// Looping
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for (let i = 0; i < str.length; i++) {
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// console.log(str[i]);
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}
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// Modifying Strings
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str[3] = "b" // can't do this
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str.replace("s","b") // replaces first instance of that character or word
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str.replaceAll("e","c")// replaces all instance of that character or word
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str.concat(" and share this video") // joins 2 strings
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const newStr = " Hello World "
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newStr.trim() // removes spaces from beginning and end
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// Searching
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str.indexOf("Coder") // index of a character or word's first appearance
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str.lastIndexOf("e") // index of a character or word's last appearance
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str.indexOf("e") // index of first appearance of "e"
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str.startsWith("S")
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str.endsWith("!")
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// Extracting Substrings
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str.substring(13, 26)
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str.slice(-14, -1)
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// Converting Case
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const toBeConverted = {name:"Piyush"}
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String(toBeConverted) // [object Object]
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JSON.stringify(toBeConverted) // '{"name":"Piyush"}'
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str.toUpperCase() // converts to uppercase
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str.toLowerCase() // converts to lowercase
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str.charCodeAt(0) // returns ASCII Code
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String.fromCharCode(65) // returns character from ASCII Code
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// String Comparison
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const str1 = "apple"
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const str2 = "apple"
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str1.localeCompare(str2) // compare strings
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str.includes("Subscribe") // checks if a word exists inside a string
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// Splitting and Joining Strings
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str.split("e")
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const arr = ["apple", "banana"]
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arr.join(" and ")
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// Ques 1 : Truncate the text
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// Write a function called truncate that checks the length of a given string - str, and if
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// it surpasses a specified maximum length, maxlength, it replaces the end of the string
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// with the ellipsis character "..." so that the length matches the maximum length
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// Input: str = "Subscribe to RoadsideCoder" , maxlength=9
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// Output: "Subscribe..."
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function truncate(str,maxlength) {
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if (str.length > maxlength)
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return str.slice(0, maxlength) + "..."
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else return str
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}
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console.log(truncate("Subscribe to RoadsideCoder", 9));

‎#6 - Strings/2-palindrome.js‎

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// Ques 2 - Palindrome Number
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// An integer is a palindrome when it reads the same forward and backward.
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// Input: x = 121 ----->>>>> Output: true
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// Input: x = 10 ----->>>>> Output: false
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var isPalindrome = function (x) {
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return x < 0 ? false : x === +x.toString().split("").reverse().join("");
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};
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const res = isPalindrome(10);
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console.log(res);
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// 121 => "121" => ["1","2","1"] => ["1","2","1"] => "121"

‎#6 - Strings/3-hamming-distance.js‎

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// Ques 3 : Hamming Distance
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// Given two strings x and y, return the Hamming distance between them.
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// Input: x = "hello", y = "hwllr"
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// Output: 2
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// Explanation:
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// (hello)
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// (hwllr)
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// ↑ ↑
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function hammingDistance(x,y) {
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if (x.length !== y.length) {
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throw new Error("Strings must be of same length")
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}
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let distance = 0;
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for (let i = 0; i < x.length; i++){
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if (x[i] !== y[i]) {
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distance++
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}
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}
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return distance
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}
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console.log(hammingDistance("hello","hwllr"));
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// Variation 2: Given two integers x and y, return the Hamming distance between thier bits.
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// Input: x = 1, y = 4
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// Output: 2
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// Explanation:
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// 1 (0 0 0 1)
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// 4 (0 1 0 0)
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// ↑ ↑
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function hammingDistance(x, y) {
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x=x.toString(2)
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y=y.toString(2)
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if (x.length < y.length) {
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while(x.length!==y.length) x="0"+x
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} else {
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while(x.length!==y.length) y="0"+y
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}
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let distance = 0;
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for (let i = 0; i < x.length; i++){
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if (x[i] !== y[i]) {
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distance++
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}
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}
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return distance
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}
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console.log(hammingDistance(2,9));

‎#6 - Strings/4-valid-anagram.js‎

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// Ques 4 - Valid Anagram
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// An Anagram is a word or phrase formed by rearranging the letters of
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// a different word or phrase, using all the original letters exactly once.
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// Input: (s = "anagram"), (t = "nagaram"); ----->>>>> Output: true;
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// Input: (s = "rat"), (t = "car"); ----->>>>> Output: false;
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// 1st Approach
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const isAnagram1 = function (s, t) {
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s = s.split("").sort().join("");
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t = t.split("").sort().join("");
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return s === t;
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};
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// anagram => [a,n,a,g,r,a,m] => [a,a,a,m,n,r] => aaamnr
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// nagaram => [n,a,g,a,r,a,m] => [a,a,a,m,n,r] => aaamnr
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const isAnagram = function (s, t) {
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if (s.length !== t.length) return false;
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let obj1 = {};
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let obj2 = {};
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for (let i = 0; i < s.length; i++) {
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obj1[s[i]] = (obj1[s[i]] || 0) + 1;
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obj2[t[i]] = (obj2[t[i]] || 0) + 1;
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}
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for (const key in obj1) {
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if (obj1[key] !== obj2[key]) return false;
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}
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return true;
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};
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console.log(isAnagram("anagram", "nagarm"));
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// rat / tar
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// {
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// r: 1,
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// a: 1,
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// t:1
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// }
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// {
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// t: 1,
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// a: 1,
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// r:1
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// }

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