浅谈JavaScript 代码整洁之道(2)

// 用 `var` 申明为大写的全局变量
var MINUTES_IN_A_YEAR = 525600;
for (var i = 0; i < MINUTES_IN_A_YEAR; i++) {
 runCronJob();
}

const cityStateRegex = /^(.+)[,\\s]+(.+?)\s*(\d{5})?$/;
saveCityState(cityStateRegex.match(cityStateRegex)[1], cityStateRegex.match(cityStateRegex)[2]);

const cityStateRegex = /^(.+)[,\\s]+(.+?)\s*(\d{5})?$/;
const match = cityStateRegex.match(cityStateRegex)
const city = match[1];
const state = match[2];
saveCityState(city, state);

var locations = ['Austin', 'New York', 'San Francisco'];
locations.forEach((l) => {
 doStuff();
 doSomeOtherStuff();
 ...
 ...
 ...
 // 等等，`l` 又是什么？
 dispatch(l);
});

var locations = ['Austin', 'New York', 'San Francisco'];
locations.forEach((location) => {
 doStuff();
 doSomeOtherStuff();
 ...
 ...
 ...
 dispatch(location);
});

var Car = {
 carMake: 'Honda',
 carModel: 'Accord',
 carColor: 'Blue'
};

function paintCar(car) {
 car.carColor = 'Red';
}

var Car = {
 make: 'Honda',
 model: 'Accord',
 color: 'Blue'
};

function paintCar(car) {
 car.color = 'Red';
}

function createMicrobrewery(name) {
 var breweryName;
 if (name) {
 breweryName = name;
 } else {
 breweryName = 'Hipster Brew Co.';
 }
}

function createMicrobrewery(name) {
 var breweryName = name || 'Hipster Brew Co.'
}