JavaScript의 일반적인 함정을 피하는 방법에 대한 팁 요약

let s = "bob"
const replaced = s.replace('b', 'l')
replaced === "lob" // 只会替换掉第一个b
s === "bob" // 并且s的值不会变

"bob".replace(/b/g, 'l') === 'lol'

// 这些可以
'abc' === 'abc' // true
1 === 1 // true
// 然而这些不行
[1,2,3] === [1,2,3] // false
{a: 1} === {a: 1} // false
{} === {} // false

typeof {} === 'object' // true
typeof 'a' === 'string' // true
typeof 1 === number // true
// 但是....
typeof [] === 'object' // true

const Greeters = []
for (var i = 0 ; i < 10 ; i++) {
 Greeters.push(function () { return console.log(i) })
}
Greeters[0]() // 10
Greeters[1]() // 10
Greeters[2]() // 10

Greeters.push(console.log.bind(null, i))

class Foo {
 constructor (name) {
 this.name = name
 }
 greet () {
 console.log('hello, this is ', this.name)
 }
 someThingAsync () {
 return Promise.resolve()
 }
 asyncGreet () {
 this.someThingAsync()
 .then(this.greet)
 }
}
new Foo('dog').asyncGreet()

asyncGreet () {
 this.someThingAsync()
 .then(this.greet.bind(this))
}

class Foo {
 constructor (name) {
 this.name = name
 this.greet = this.greet.bind(this)
 }
}

asyncGreet () {
 this.someThingAsync()
 .then(() => {
 this.greet()
 })
}

Math.min() < Math.max() // false