Codekata💢

replace / subString / splice

// 복소수 계산 문제
const complexNumberMultiply = (a, b) => {
  a = a.replace("i", "");
  b = b.replace("i", "");
  let array1 = a.split("+");
  let array2 = b.split("+");
  let front_value = String(
    Number(array1[0]) * Number(array2[0]) +
      Number(array1[1]) * Number(array2[1]) * -1
  );

  let back_value = String(
    Number(array1[0]) * Number(array2[1]) +
      Number(array1[1]) * Number(array2[0])
  );
  return `${front_value}+${back_value}i`;
};

life cycle

this.state.property? this.function: null

this.state.property && this.function

本日CSS🎨

grid & flex

.ProductListMain {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    grid-auto-rows: minmax(100px, auto);


    // display: flex;
    // flex-wrap: wrap;
    // width: 800px;
}