todo:1 [Math Random]
- লুডু খেলায় আমরা কিভাবে ১ থেকে ৬ সংখ্যা randomly print করতে পারি ।
function getRandomNumber(min, max){
return Math.floor(Math.random() *(max-min +1)) + min;
}
console.log(getRandomNumber(1,6));
// another way
const random1 =((Math.random()*10)+1);
const random2 =Math.floor(((Math.random()*7)));
console.log(random1) // print 1-6
console.log(random2) // print 1-6
- Get random id or Reverse id
const id = Math.random().toString().split(".")[1];
const id1 =crypto.randomUUID();
const revId = id.split("").reverse().join("");
const revId1 = id1.split("").reverse().join("");
console.log(id," | ",revId) // 6024356929627508 | 8057269296534206
console.log(id1, " | ",revId1) // 83fdaf7b-ec0b-49f3-b161-0f5c78c81d41 | 14d18c87c5f0-161b-3f94-b0ce-b7fadf38
const num =12345;
const r =Number(num.toString().split("").reverse().join(""));
console.log(num, "|||" ,r) // 12345 ||| 54321
- Reverse Sting
let str1 ="bappasaha"
const reverse =str1.split("").reverse().join("");
console.log(str1, "<->",reverse) // bappasaha <-> ahasappab
let str ="b-a-p-p-a";
console.log(str.split("-")) ;
console.log(str.split("-").join(","));
todo:2- [sort ( ) ] সবার নাম কিভাবে Alphabetically সাজাতে পারি ।
- সবার নাম কিভাবে Alphabetically সাজাতে পারি ।
const std = ["bappa","kaoa","dafda","apple"];
console.log(std.sort());
- How to sort roll number low to high
const rollNumebers = [40, 100, 1, 5, 25, 10];
function myFuc(a,b){
return a-b;
};
console.log(rollNumebers.sort(myFuc)) // [ 1, 5, 10, 25, 40, 100 ]
//shortcut
const rollNumebers = [40, 100, 1, 5, 25, 10];
console.log(rollNumebers.sort((a,b)=>{return a-b})) // assending
console.log(rollNumebers.sort((a,b)=>{return b-a})) //decending
todo: 3- [filter ( )] find the duplicate and Unique number and string from an array
- find the duplicate number from an array
// const arr = ["bappa", "appa", "cappa", "bappa"];
// const item = arr.forEach((item, index, arr) => console.log("items:",item));
// const d = arr.filter((item, index) => console.log(arr.indexOf(item) !==index));
// const i = arr.filter((item, index) => console.log(arr.indexOf(index)));
const numbers =[1,2,4,5,6,6,1,5,76,,89,76,90,25];
const duplicate =numbers.filter((value,index, array)=>{
return array.indexOf(value)!==index;
});
console.log(duplicate);
const arr = ["bappa", "appa", "cappa", "bappa"];
const duplicates = arr.filter((item, index) => arr.indexOf(item) !== index);
console.log(duplicates); // Output: ["bappa"]
- find the unique number from an array
const numbers1 =[1,2,4,5,6,6,1,5,76,,89,76,90,25];
const unique =numbers.filter((value,index, array)=>{
return array.indexOf(value)===index;
});
console.log('---');
console.log(unique);
const arr = ["bappa", "appa", "cappa", "bappa"];
const uniqueItems = arr.filter((item, index) => arr.indexOf(item) === arr.lastIndexOf(item));
console.log(uniqueItems); // Output: ["appa", "cappa"]
todo:-4 How many vowels in sentence
const vowels =["a","e","i","o","u","A","E","I","O","U"];
const countVowel=(sentence)=>{
let count =0;
const letters =Array.from(sentence);
letters.forEach((letter)=>{
if(vowels.includes(letter)){
count++;
}
})
return count;
};
console.log(countVowel("I love Bangladesh"));
todo:-5 Leap year or Not
function isLeapyear(year){
if(year%400 ===0 || ((year %4 ===0) && (year % 100 !==0))){
console.log(`${year} is Leap year`);
}
else
console.log('not');
};
isLeapyear(2020);
todo:-6: how many time "bappa" word is used in the sentence and what is the first position where bappa word is used?
This type of problem is solved by using regular expression
-
regular exper vittore search string ta dibo -
igflag ta dibo. - jotogulo ans pabo ta ekta array tai array er length tai ans
solve:
first position mane search() ta dilei hbe
const sentence ="There is a dreamy boy nameed Bappa.There is a dreamy boy nameed bappa.There is a dreamy boy nameed bappa.There is a dreamy boy."
const matches =sentence.match(/bappa/ig);
const occurances =matches? matches.length : 0;
console.log(matches, occurances)
let position =sentence.search(/bappa/i);
position= position>=0 ? position : "not found";
console.log(position)
todo:7 input: linearSearch(['a','b','c','d','c'], 'c'); output: 2 or 'not found' ; problem: linearSearch() টি function implement করে দেখান ।
function linearSearch(arr,value){
const length =arr.length;
for(let i =0; i<length; i++){
if(arr[i]===value){
return i;
}
}
return "not found";
}
console.log(linearSearch(['a','b','c','d','c'], 'c'));
todo:8- find out the max big string from an array and show the index of the string
function longestString(names){
let longestWord ='';
for(n of names){
if(n.length > longestWord.length){
longestWord =n;
}
}
return [longestWord, names.indexOf(longestWord)]
}
const nameArray=['Bappa saha', 'learn with bappa','akash','akash mohajoon','dad'];
console.log(longestString(nameArray));
todo:9- ১ -১০০ পর্যন্ত যেই সংখ্যা গুলো ৩,৫ এবং ৩,৫ উভয় সংখ্যা দিয়ে বিভাজ্য তা বের কর
function fooBar(number){
for (let i =1; i<=number; i++){
if(i%3===0 && i%5===0){
console.log(`${i} is fooBar number`);
}
else if(i%3===0){
console.log(`${i} is divied by 3`);
}
else if(i%5 ===0){
console.log(`${i} is divied by 5`)
}
else{
console.log(`${i} is not divied by 3 or 5`);
}
}
}
console.log(fooBar(100))
todo:10- Remove falsy values from array and object
-
Array থেকে কিভাবে 'falsy value' খুঁজে বের করে বাদ দিতে পারি?
falsy values are: 6 types false, undefined, null, '', NaN, 0 solve: using filter()
const mixedArr =[
"bws",
undefined,
"learn with bappa",
0,
false,
"",
"apple",
null,
40,
"k",
true,
"Thanks all",
NaN
];
const trueArray =mixedArr.filter(element=>{
if(element){
return true;
}else{
return false
}
})
console.table(trueArray)
// another way
const trueArray1 =mixedArr.filter(Boolean)
console.table(trueArray1)
- Object থেকে কিভাবে 'falsy value' খুঁজে বের করে বাদ দিতে পারি?
const obj ={
a:"bws",
b:undefined,
c:"learn with bappa",
d:0,
e:false,
f:"",
g:"apple",
h:null,
i:40,
j:"k",
k:true,
l:"Thanks all",
m:NaN
};
const trutyObj =function(obj){
for(let i in obj){
if(!obj[i]){
delete obj[i];
}
}
return obj;
}
console.log(trutyObj(obj))
Top comments (0)