How can i make pyramid by use javaScript

Question

I want to do like this

1
232
34543
4567654

This is my code can somebody help me i try for 5 days to solve it. Thank you for help me

var n = 8;
for (var i = 0; i < n; i++) {
var str = '';
for (var j = 1; j < n-i; j++) {
str = str + '';
}
for (var k = 1; k <= (2*i+1); k++) {
str = str + '*';
}
//for (var l = 1; l < n; l--) {
// str = str + 'k';
// }
console.log(str);
}

Answer 1

// only for loops:

function shape(n) {
var i, j, k, s = '';
for (i=0; i<n; ++i) {
k = i+1, s = s && s+'\n';
for (j=0; j<n-k; ++j) s += ' ';
for (j=0; j<k; ++j) s += (k+j)%10;
for (j=i-1; 0<=j; --j) s += (k+j)%10;
}
return s;
}

document.write('<pre>'+shape(8)+'</pre>');

// pattern reflect pattern in your question, not pattern in video (increase vs decrease digits)

Answer 2

Are u trying to print * or numbers ?

Answer 3

did you try to get:

var dig = (v,i) => (v+i)%10,
rev = s => [...s].reverse().join(''),
row = (v,i) => ' '.repeat(n- ++i)+(v = Array(i).fill(i).map(dig).join(''))+rev(v.slice(0,-1)),
shape = n => Array(n).fill().map(row).join('\n');

document.write('<pre>'+shape(8)+'</pre>');

Answer 4

so, just adapt my code by replacing the 'row' map function with outer for loop, the 'dig' map function with inner for loop, and if needed also for what you want ^^

Answer 5

i want to use for loop to make it like this video

https://youtu.be/VKJNLp5ZKb4

but i cannot do it in javascript

Answer 6

thank you very much sir