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3 changes: 3 additions & 0 deletionselementaryAlgo/ASCII.js
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console.log("a".codePointAt(0));
console.log("a".charCodeAt(0));
console.log(String.fromCharCode(97));
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let obj = { name: "rabo", age: 44 };
const map = new Map(Object.entries(obj));
console.log(map);
console.log(Object.entries(obj));
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let obj = { name: "rabo", detail: { age: 70, bank: { byy: 6667, num: 6667 } } };
const allProperties = (obj) => {
for (let prop in obj) {
if (typeof obj[prop] !== "object") {
console.log(prop + " " + obj[prop] + "");
} else {
allProperties(obj[prop]);
}
}
};
console.log(allProperties(obj));
18 changes: 18 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/excludePropUsinJSON.js
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const obj = {
id: 1,
username: "Rabo",
email: "raboyus@agmail.com",
password: "password35678",
};
//copy the obj while excluding password
console.log(JSON.stringify(obj, ["id", "username", "email"]));
console.log(JSON.parse(JSON.stringify(obj, ["id", "username", "email"])));

//another way
console.log(
JSON.parse(
JSON.stringify(obj, (key, value) =>
key === "password" ? undefined : value
)
)
);
10 changes: 10 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/firstLastChar.js
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function getTheGapX(str) {
if (!str.includes("X")) {
return -1;
}
const firstIndex = str.indexOf("X");
const lastIndex = str.lastIndexOf("X");
return firstIndex === lastIndex ? -1 : lastIndex - firstIndex;
}
console.log(getTheGapX("JavaScript"));
getTheGapX("Xamarin");
7 changes: 7 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/howToEmptyObj.js
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let ob = { name: "9" };
for (let key in ob) {
if (ob.hasOwnProperty(key)) {
delete ob[key];
}
}
console.log(ob);
34 changes: 34 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/objectCopy.js
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const obj = { name: "rabo", description: "black and brain" };
//shallow copy
let shallow = { ...obj };
console.log(shallow);
//shallow copy and add properties
let shallowCopy = { ...obj, age: 0 };
console.log(shallowCopy);
//shallow copy by Object.assign();
let shallowAssign = Object.assign({}, obj, { country: "nigeria" });
console.log(shallowAssign);
//stringify
let dee = { age: 67, email: "rab@gmail.com", desp: { num: 0 } };
let fee = dee;
//console.log(fee.desp === dee.desp);
let copy = JSON.stringify(dee);
console.log(copy);
let copyByJSON = JSON.parse(copy);
//becasue of deep clone these two objects are not the same object
console.log(copyByJSON.desp === dee.desp);
//deep copy: JavaScript do not has a deep copy method but we can implement it
function deepCopy(obj) {
if (!obj) return obj;
let copyObj = {};
for (let key in copyObj) {
if (typeof obj[key] !== "object" || Array.isArray(obj[key])) {
copyObj[key] = obj[key];
} else {
copyObj[key] = deepCopy(obj[key]);
}
}
return copyObj;
}
let t = { name: "rabo", details: { col: "black" } };
console.log(deepCopy(t));
24 changes: 24 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/replaceThreeCenter.js
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const a = [1, 2, 3, 4, 5];
const b = [4, 0, 0, 0, 8];

const startPositionFor1stArray = a.length / 2 - 1;
const startPositionFor2ndArray = b.length / 2 - 1;
//console.log(startPositionFor1stArray, startPositionFor2ndArray);
console.log(a.splice(startPositionFor1stArray));
a.splice(
startPositionFor1stArray,
3,
...b.slice(startPositionFor2ndArray, startPositionFor2ndArray + 3)
);

const books = [
{ name: "Warcross", author: "Marie Lu" },
{ name: "The Hunger Games", author: "Suzanne Collins" },
{ name: "Harry Potter", author: "Joanne Rowling" },
];
const sortedObj = books.sort((a, b) => {
let book1 = a.author.split(" ")[1];
let book2 = b.author.split(" ")[1];
return book1 < book2 ? 1 : -1;
});
console.log(sortedObj);
6 changes: 6 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/reverseEachWord.js
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const str = "JavaScript is awesome";
const arrayReverseWords = str
.split(" ")
.map((word) => word.split("").reverse().join(""))
.join(" ");
console.log(arrayReverseWords);
4 changes: 4 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/reverseNum.js
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let num = 3849;

let numStr = String(num);
+numStr.split("").reverse().join(""); // 9483
37 changes: 37 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/threeWaysToLoopStr.js
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let str = "hello world";
for (let i = 0; i < str.length; i++) {
console.log(str.charAt(i));
}
for (let word in str) {
console.log(str[word]);
}
[...str].forEach((word) => console.log(word));
for (let char of str) {
console.log(char);
}

Math.abs(-5); // 5
Math.floor(1.6); // 1
Math.ceil(2.4); // 3
Math.round(3.8); // 4
Math.max(-4, 5, 6); // 6
Math.min(-7, -2, 3); // -7
Math.sqrt(64); // 8
Math.pow(5, 3); // 125
Math.trunc(-6.3); // -6
const isInt = (value) => {
return value % 1 === 0;
};
console.log(isInt(1));
console.log(isInt(-6661));
console.log(isInt(0));
console.log(isInt(4.4));
console.log(isInt(1.6));
console.log(1 % 1);
console.log(3 % 1);
console.log(4 % 10);
console.log(50.4 % 1);
const randomNum = (start, end) => {
return Math.floor(Math.random() * (end - start)) + start;
};
console.log(randomNum(1, 5));
111 changes: 111 additions & 0 deletionselementaryAlgo/JavaScriptCodeChallenge/waysToCreateObject.js
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let obj = { name: "random", email: "random@example.com" };
const result = Object.create(obj);
result.age = 800;
result.speak = function () {
return `My name is ${this.name} and I am ${this.age} years old.`;
};
console.log(result);
console.log(result.name);
console.log(result.age);
console.log(result.hasOwnProperty("name"));
console.log(result.hasOwnProperty("age"));
console.log(result.hasOwnProperty("speak"));
console.log(result.speak());
let protoRabbit = {
speak(line) {
return `The ${this.type} rabbit says '${line}'`;
},
};
let killerRabbit = Object.create(protoRabbit);
killerRabbit.type = "killer";
console.log(killerRabbit.hasOwnProperty("type"));
console.log(killerRabbit.speak("SKREEEE!"));
// → The killer rabbit says 'SKREEEE!
function factoryFunc(key, value) {
return {
key,
value,
};
}
let factory = new factoryFunc("age", 78);
console.log(factory.value);
console.log(factory.hasOwnProperty("value"));
function facFunc(key, value) {
this[key] = value;
}
const fa = new facFunc("name", 800);
console.log(fa.name);
class Constr {
constructor(name, age = 0) {
this.name = name;
this.age = age;
}
getName() {
return this.name;
}
}
const ob = { name: "hello" };
for (let key in ob) {
if (ob.hasOwnProperty(key)) {
console.log(key);
}
}

for (let key of Object.keys(ob)) {
if (ob.hasOwnProperty(key)) {
console.log(key);
}
}
Object.keys(ob).forEach((key) => {
if (ob.hasOwnProperty(key)) {
console.log(key);
}
});
const countKey = (obj) => {
let count = 0;
Object.keys(obj).forEach((key) => {
if (obj.hasOwnProperty(key)) {
count += 1;
}
});
return count;
};
console.log(countKey(ob));
console.log(Object.create(obj).toString());
console.log(Object.create(null));
let valuePairs = [
["0", 0],
["1", 1],
["2", 2],
];
let objPair = Object.fromEntries(valuePairs);
console.log(objPair);
let map = new Map([
["age", 80],
["name", "rabo"],
]);
let mapPair = Object.fromEntries(map);
console.log(mapPair);
for (let [key, value] of map) {
console.log(key, value);
}
console.log(new Set([8, 9, 0]));
// let obj1 = {age: 56},
// obj2 = {col: 'red'};
// obj1.setPrototypeOf(obj2)
const obj1 = { a: 1 };
const obj2 = { b: 2 };
Object.setPrototypeOf(obj2, obj1);
//obj2.__proto__ = obj1;
console.log(obj1.isPrototypeOf(obj2));
let objWithGetSet = {};
let o = Object.defineProperty(objWithGetSet, "data", {
data: 0,
get() {
return this.value;
},
set(value) {
this.value = value;
},
});
o.data = 90;
4 changes: 4 additions & 0 deletionselementaryAlgo/addTwoNumber.js
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const addTwoNumber = (num1, num2) => {
return num1 + num2;
};
console.log(addTwoNumber(2, 4));
17 changes: 17 additions & 0 deletionselementaryAlgo/alvin/alternateCap.js
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// Write a function `alternatingCaps` that accepts a sentence string as an argument. The function should
// return the sentence where words alternate between lowercase and uppercase.
const alternatingCaps = (words) => {
let result = "";
let arraySplit = words.split(" ");
for (let i = 0; i < arraySplit.length; i++) {
let word = arraySplit[i];
if (i % 2 === 0) {
result += word.toLowerCase() + " ";
} else {
result += word.toUpperCase() + " ";
}
}
return result;
};
console.log(alternatingCaps("take them to school")); // 'take THEM to SCHOOL'
console.log(alternatingCaps("What did ThEy EAT before?")); // 'what DID they EAT before?'
19 changes: 19 additions & 0 deletionselementaryAlgo/alvin/bleepVowels.js
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// Write a function `bleepVowels` that accepts a string as an argument. The function should return
// a new string where all vowels are replaced with `*`s. Vowels are the letters a, e, i, o, u.
function bleepVowels(str) {
let array = ["a", "e", "i", "o", "u"];
let result = "";
for (let i = 0; i < str.length; i++) {
let char = str[i];
if (array.indexOf(char) > -1) {
result += "*";
} else {
result += char;
}
}
return result;
}
console.log(bleepVowels("skateboard")); // 'sk*t*b**rd'
console.log(bleepVowels("slipper")); // 'sl*pp*r'
console.log(bleepVowels("range")); // 'r*ng*'
console.log(bleepVowels("brisk morning")); // 'br*sk m*rn*ng'
16 changes: 16 additions & 0 deletionselementaryAlgo/alvin/chooseDivisible.js
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// Write a function `chooseDivisibles(numbers, target)` that accepts an array of numbers and a
// target number as arguments. The function should return an array containing elements of the original
// array that are divisible by the target.
const chooseDivisibles = (numbers, target) => {
let result = [];
for (let i = 0; i < numbers.length; i++) {
let num = numbers[i];
if (num % target === 0) {
result.push(num);
}
}
return result;
};
console.log(chooseDivisibles([40, 7, 22, 20, 24], 4)); // [40, 20, 24]
console.log(chooseDivisibles([9, 33, 8, 17], 3)); // [9, 33]
console.log(chooseDivisibles([4, 25, 1000], 10)); // [1000]
16 changes: 16 additions & 0 deletionselementaryAlgo/alvin/combinations.js
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const combinations = (array) => {
if (array.length === 0) return [[]];
let firstElem = array[0];
let withFirst = array.slice(1);
let combinationWithFirstElem = [];
let combinationWithoutFirstElem = combinations(withFirst);
combinationWithoutFirstElem.forEach((arr) => {
let WithFirstElem = [...arr, firstElem];
combinationWithFirstElem.push(WithFirstElem);
});
return [...combinationWithFirstElem, ...combinationWithoutFirstElem];
};
console.log(combinations(["a", "b", "c"]));
console.log(combinations(["a", "b"]));
//Time : O(2^n)
//Space : O(n * n)
21 changes: 21 additions & 0 deletionselementaryAlgo/alvin/commonElement.js
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// Write a function `commonElements` that accepts two arrays as arguments. The function should return
// a new array containing the elements that are found in both of the input arrays. The order of
// the elements in the output array doesn't matter as long as the function returns the correct elements.
const commonElements = (array1, array2) => {
let result = [];
let set1 = new Set(array1);
let set2 = new Set(array2);
for (let elem of set1) {
if (set2.has(elem)) {
result.push(elem);
}
}
return result;
};
let arr1 = ["a", "c", "d", "b"];
let arr2 = ["b", "a", "y"];
console.log(commonElements(arr1, arr2)); // ['a', 'b']

let arr3 = [4, 7];
let arr4 = [32, 7, 1, 4];
console.log(commonElements(arr3, arr4)); // [4, 7]
15 changes: 15 additions & 0 deletionselementaryAlgo/alvin/divisors.js
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// Write a function `divisors` that accepts a number as an argument. The function should return an
// array containing all positive numbers that can divide into the argument.
function divisors(num) {
let result = [];
for (let i = 1; i <= num; i++) {
let eachNum = i;
if (num % eachNum === 0) {
result.push(eachNum);
}
}
return result;
}
console.log(divisors(15)); // [1, 3, 5, 15]
console.log(divisors(7)); // [1, 7]
console.log(divisors(24)); // [1, 2, 3, 4, 6, 8, 12, 24]
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