print with matrix

prm.js

function drawCicle(diameter = 3, placeholder='*') {
    diameter = Math.floor(diameter)
    diameter = diameter < 3 ? 3 : diameter
    const mtx = matrix(diameter)
    return translate(mtx, placeholder)
    
}
function matrix(len) {
    const m = len
    const n = len
    const g = function (l) {
        return new Array(l).fill(0)
    }
    return new Array(n).fill(0).map(() => g(m))
}
function translate(mtx, placeholder) {
    const len = mtx.length
    const mid = Math.ceil(len/2)
    const m = mtx.map((tx, i) => {
        const dis = Math.abs(i + 1 - mid)
        return tx.map((x, j) => {
            const c = j + 1
            if (c < mid) {
                return c <= dis ? 0 : 1
            } else if (c === mid) {
                return 1
            } else {
                const d = len - c
                return d < dis ? 0 : 1
            }
        }).map(x => x === 0 ? ' ' : placeholder).join('')+'\n'
    }).join('')
    return m
}

console.log(drawCicle(7, 'o'))