JS Snippets: String

JavaScript

Ref­er­ences

• Scrim­ba: JavaScript In­ter­view Chal­lenges
• MLT GitHub: JavaScript Home­work Tasks

Re­verse a String

function reverse(str: string) {
    return str.split("").reverse().join("");
}

function reverse(str: string) {
    let newStr = "";
    for (let i = str.length - 1; i >= 0; i--) newStr += str[i];
    return newStr;
}

Is Palin­drome

• Palin­dromes are words that are the same for­ward or back­ward.

function isPalindrome(str: string) {
    return str === str.split("").reverse().join("");
}

Is Ana­gram

• Ana­grams are groups of words that can be spelled with the same let­ters.

function isAnagram(str1: string, str2: string) {
    if (str1.length !== str2.length) return false;
    return str1.split("").sort().join("") === str2.split("").sort().join("");
}

Is Ana­gram: Sen­tences in Ar­ray

• Scrim­ba chal­lenge: Find ana­gram in ar­ray.

function sortPhrase(phrase) {
  return phrase.toLowerCase().split("").sort().join("").trim("");
}

function isAnagramInArray(anagram, arr) {
  const anagramSorted = sortPhrase(anagram);
  return arr.filter((entry) => anagramSorted === sortPhrase(entry));
}

const anagrams = [
  "moz biblical torchbearers",
  "it's razorbill beachcomber",
  "och mcrobbie trailblazers",
  "bib chorizo cellarmaster",
  "thor scribble carbimazole",
];

console.log(isAnagramInArray("Bob Ziroll Scrimba Teacher", anagrams));

(3) ['moz biblical torchbearers', 'och mcrobbie trailblazers', 'thor scribble carbimazole']

Ti­tle Case

• Write a func­tion that will cap­i­tal­ize every word in a sen­tence.

function capitalizeWord(word: string) {
    return word[0].toUpperCase() + word.slice(1);
}

function toTitleCase(str: string) {
    return str.split(" ").map(word => capitalizeWord(word)).join(" ");
}

console.log(toTitleCase("pumpkin pranced purposefully across the pond"));

Pumpkin Pranced Purposefully Across The Pond

Re­move the Du­pli­cate Chars

function removeDupeChars(chars: string) {
    let output = "";
    for (const char of chars)
        if (!output.includes(char))
            output += char;
    return output;
}

console.log(removeDupeChars("pumpkin pranced purposefully across the pond"));

pumkin racedosflyth

Reg­is­ter: JavaScript

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