Handle array in javascript

Array.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Array {

    uint[] public numbers;
    string[] public words;

    function getNumbers() public view returns(uint[] memory) {
        return numbers;
    }

    function addNumber(uint number) public {
        numbers.push(number);
    }

    function getNumber(uint num) public view returns(bool) {
        for (uint number = 0; number < numbers.length; number++) {
            if(numbers[number] == num) {
                return true;
            }
        }
        return false;
    }

    function getWords() public view returns(string[] memory) {
        return words;
    }

    function addWord(string memory word) public {
        words.push(word);
    }

    function getWord(string memory word) public view returns(bool) {
        for (uint i = 0; i < words.length; i++) {
            string memory tmp = words[i];
            // https://ethereum.stackexchange.com/a/30914
            if(keccak256(abi.encode((tmp))) == keccak256(abi.encode((word)))) {
                return true;
            }
        }
        return false;
    }
}