[配列に要素が追加されない]　TypeScriptの(おそらく基本的な)疑問(React+typescript)

type culumnStone = {
    culumnKye: number;
    isPut: boolean;
    changeDirection: number;
    isCollor: boolean | null;
  }
  
  type rowStone = {
    rowKey: number;
    rowStones: culumnStone[];
  }

export const formBoard = () => {
    const n = 6;
    const ansArr:rowStone[] = []
    for (var i = 0; i < n; i++){
        const tempArr:culumnStone[] = []
        for (var j = 0; j < n; j++){
            const temObj =  {
                culumnKye: j,
                isPut: false,
                changeDirection: 0,
                isCollor:null
            }
            tempArr.concat([
                {...temObj}
            ])
        }
        ansArr.concat([{rowKey:i,rowStones:[...tempArr]}])
    }
    console.log(ansArr)
    return ansArr;
}