几个简单js，普通写法和高逼格写法比较

let arr = [0, 1, null, ‘‘, ‘abc‘];
let newArr = [];
arr.forEach((item, index) => {
    if (!item) {
        newArr[index] = ‘我原来是空值‘;
    } else {
        newArr.push(item);
    }
})

let arr = [0, 1, null, ‘‘, ‘abc‘];
let newArr = [];
arr.forEach((item, index) => {
   newArr.push(item || item = ‘这种写法是不是很屌？‘))
})

let num = 1.12;
let intNum = parseInt(num);

let num = 1.12;
let intNum;

// 写法一：
intNum = num|0;

// 写法二：
intNum = ~~num;

// 写法三：
intNum = num^0;

let num1 = 5, num2 = 6;
num1 = num1 + num2;
num2 = num1 - num2;
num1 = num1 - num2;

// 常规写法二：
num1 ^= num2;
num2 ^= num1;
num1 ^= num2;

let num1 = 5, num2 = 6;
num1 = [num2, num2 = num1][0];

function fn(name) {
    if (name) {
        name = name;
    } else {
        name = ‘我是默认值‘；
    }
}
// 常规写法二：
function fn(name) {
　　name = name || ‘我是默认值‘;
　　return name;
}

function fn(name = ‘我是默认值‘) {
    return name;
}