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Testing a partial prorogram: Why is Modulus function not working? [closed]

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const marks = [80];
const grade = ['A', 'B', 'C', 'D', 'F'];
let sum = 0;
console.log(checkGrade(marks));
function checkGrade(array) {
for (let item of array)
sum += item;
const avg = sum / array.length;
let gradePoint = Math.floor((100 - avg) / 10);
return gradePoint % 10;
}

as Your code, the avg is = 80
and (100-avg) / 10 = 2 which is gradePoint
and you are returning gradePoint % 10
that means 2 % 10
which is returning 2.
and it is working perfectly. Where is the issue?

Make a recursive function in JavaScript [closed]

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I am trying to make a recursive function for this parameters. Function should determine the nth element of the row
a_0 = 1
a_k = k*a_(k-1) + 1/k
k = 1,2,3...
I am trying really hard to do this but i cant get a result. Please help me to do this
I came up with this but it is not a recursive function. I can not do this as a recursive function
let a = 1
let k = 1
let n = 3
for (let i = 1; i<=n; i++){
a = i*a + 1/i
}
console.log(a)

Here's the recursive function you're looking for, it has two conditions:
k == 0 => 1
k != 0 => k * fn(k - 1) + 1/k
function fn(k) {
if(k <= 0) return 1;
return k * fn(k - 1) + 1/k;
}
console.log(fn(1));
console.log(fn(2));
console.log(fn(3));
console.log(fn(4));
Note: I changed the condition of k == 0 to k <= 0 in the actual function so it won't stuck in an infinite loop if you pass a negative k

How to decrease numbers from an array in javascript [closed]

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There are numbers in an array like 54321
array = ["54321"] ;
Now how can I print in console
54321
5432
543
54
5
I don't want to print it manually, I want to print it dynamically..
Thanks in advance.

const array = ["54321"];
const print = ([x]) => {
if (x.length === 0) return;
console.log(x);
print([x.slice(0, -1)]);
}
print(array)

You can split the string into array and the use reduce function
ler arr = array[0].split('');
let result = arr.reduce((acc,i) => {
acc.newarr.push(arr.slice(0,acc.counter).join(''));
acc.counter--;
return acc;
},
{newarr:[],counter:5});
console.log(result);

const array = ["54321"];
const un_print = ([str]) =>
Array.from(
{ length: str.length },
(_, i) => (i + 1) + '. ' + str.slice(0, str.length - i)
)
.forEach((v) => console.log(v));
un_print(array);

Create an array of 20 random numbers [closed]

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I need to create an array of 20 random numbers in the range from -10 to 10 inclusive and Check whether all numbers match the parameters (from -10 to 10).
here is my code:
let array = [];
for (let i = 0; i < array.length; i++) {
array.push(Math.round((Math.random() * 21) - 10));
}
console.log(array);

It should be more like this
let array = [];
for(let i=0; i<20; i++){
array.push(Math.round((Math.random() * 21) - 10));
}
console.log(array);

This will do the trick,
var array = Array(20).fill().map(() => Math.round(Math.random() * 20) - 10);
console.log(array)

Find extra character between two strings [closed]

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How can I find an extra character between two strings in an optimal way.
Ex1: S1 - 'abcd', S2 - 'abcxd', output - 'x'
Ex2: S1 - '100001', S2 - '1000011', output - '1'
We can do this by traversing linearly and comparing each character in O(n). I want this to be done in much more optimal way, say in O(logn)

Baseline method (O(n)): Just comparing chars and narrowing in on both sides each cycle.
function findDiffChar(base, baseExtraChar) {
let extraLastIndex = base.length;
let lastIndex = extraLastIndex - 1;
for (let i = 0; i < extraLastIndex / 2; i++) {
console.log(`Loop: ${i}`);
if (base[i] !== baseExtraChar[i])
return baseExtraChar[i];
if (base[lastIndex - i] !== baseExtraChar[extraLastIndex - i])
return baseExtraChar[extraLastIndex - i];
}
return false;
}
console.log(findDiffChar('FOOOOOAR', 'FOOOOOBAR')); // B
Improved method using binary search (O(log n)): Compare halves until you've narrowed it down to one character.
function findDiffChar(base, baseExtraChar) {
if (baseExtraChar.length === 1) return baseExtraChar.charAt(0);
let halfBaseLen = Number.parseInt(base.length / 2) || 1;
let halfBase = base.substring(0,halfBaseLen);
let halfBaseExtra = baseExtraChar.substring(0,halfBaseLen);
return (halfBase !== halfBaseExtra)
? findDiffChar(halfBase, halfBaseExtra)
: findDiffChar(base.substring(halfBaseLen),baseExtraChar.substring(halfBaseLen));
}
console.log(findDiffChar('FOOOOAR', 'FOOOOBAR')); // B
console.log(findDiffChar('---------', '--------X')); // X
console.log(findDiffChar('-----------', '-----X-----')); // X
console.log(findDiffChar('------------', '---X--------')); // X
console.log(findDiffChar('----------', '-X--------')); // X
console.log(findDiffChar('----------', 'X---------')); // X