Hello I'm having a problem. I want to create a triangular number pattern as follows:
Output:
1223334444333221
=22333444433322=
===3334444333===
======4444======I've tried to make the program. But the logic I use is not quite right.
function nomor4(level) {
let len = null;
let result = [];
while (level > 0) {
let arr = [];
for (let i = 1; i < level; i++) {
for (let repeat = 0; repeat <i; repeat++){
arr.push(i)
}
}
// convert arr.push value from array to string using join
//and add 1 and the copy value using reverse
let str_level = arr.join("") + "4444" + arr.reverse().join("");
if (len == null) {
len = str_level.length;
}
//Add Strip
while (str_level.length < len) {
str_level = "-" + str_level + "-";
}
result.push(str_level);
level--;
}
return result.join("\n");
}
console.log(nomor4(4))if anyone can. please help me give the solution. Thank you
Here's a way of doing this by using two nested maps over arrays of rows (a counter for each row) and columns (the values to print in each row)
const size = 4
const fill = '='
const rows = Array.from({length: size}, (_, i) => i + 1) // 1,2,3,4
const cols = rows.concat(rows.slice(0, -1).reverse()) // 1,2,3,4,3,2,1
const result = rows
.map(r => cols
.map(c => ((c >= r) ? c : fill).toString().repeat(c)
).join('')
).join('\n')
console.log(result)There are better ways than this, but I will put this here just to show how to do it with minimal changes from the OP (I just changed - to = and the for loop with i).
function nomor4(level) {
let len = null;
let result = [];
while (level > 0) {
let arr = [];
for (let i = 5-level; i < 4; i++) {
for (let repeat = 0; repeat <i; repeat++){
arr.push(i)
}
}
// convert arr.push value from array to string using join
//and add 1 and the copy value using reverse
let str_level = arr.join("") + "4444" + arr.reverse().join("");
if (len == null) {
len = str_level.length;
}
//Add Strip
while (str_level.length < len) {
str_level = "=" + str_level + "=";
}
result.push(str_level);
level--;
}
return result.join("\n");
}
console.log(nomor4(4))function nomor4(level) {
let realValue = level;
let len = null;
let result = [];
while (level >= 0) {
let arr = [];
for (let i = 1; i <= realValue; i++) {
if (realValue !== i) {
for (let repeat = 0; repeat < i; repeat++) {
if (realValue - level <= i) {
arr.push(i);
}
}
}
}
// convert arr.push value from array to string using join
// and add 1 and the copy value using reverse
let str_level = arr.join("") + "4444" + arr.reverse().join("");
if (len == null) {
len = str_level.length;
}
//Add Strip
while (str_level.length < len) {
str_level = "-" + str_level + "-";
}
result.push(str_level);
result = [...new Set(result)];
level--;
}
return result.join("\n");
}
console.log(nomor4(4));