Array - squareUp b!.js

/*
Description:
This is a question from codingbat

Given an integer n greater than or equal to 0, create and return an array with the following pattern:

squareUp(3) => [0, 0, 1, 0, 2, 1, 3, 2, 1]
squareUp(2) => [0, 1, 2, 1]
squareUp(4) => [0, 0, 0, 1, 0, 0, 2, 1, 0, 3, 2, 1, 4, 3, 2, 1]
n<=1000.

Check out my other kata!
Matrix Diagonal Sort OMG

String -> N iterations -> String

String -> X iterations -> String

ANTISTRING

Array - squareUp b!

Matrix - squareUp b!

Infinitely Nested Radical Expressions

pipi Numbers!

PUZZLES
*/
function squareUp(n)
{
    const arr0=Array(n).fill(0)
    const arr=[];
    const answ=[];
    for (let i=n;i>0;i--){
      arr.push(i)
    }
    for (let i=n;i>=0;i--){
     answ.push(arr0.slice(0,i).concat(arr.slice(i)))
    }
    return [].concat(...answ.filter(v=>!v.every(v=>v===0)))
}