I want to make JavaScript number pyramid

Question

I want to make like this

1
232
34543
4567654

This is my code

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);
}

i try it for 3days and I cannot pass it. Thank you very much for help.

Answer 1

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>');