Map object

const map1 = new Map();

map1.set("a", 1);
map1.set("b", 2);
map1.set("c", 3);

console.log(map1.get("a"));
// expected output: 1

map1.set("a", 97);

console.log(map1.get("a"));
// expected output: 97

console.log(map1.size);
// expected output: 3

map1.delete("b");

console.log(map1.size);
// expected output: 2

validParentheses(strArr: string): boolean {
    const mapP = new Map([
      ["(", ")"],
      ["{", "}"],
      ["[", "]"],
    ]);
    let arr = [];
    for (let i = 0; i < strArr.length; i++) {
      arr.push(strArr[i]);
      if (
        arr.length > 1 &&
        mapP.get(arr[arr.length - 2]) === arr[arr.length - 1]
      )
        arr.splice(arr.length - 2, 2);
    }
    return arr.length == 0 ? true : false;
}