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Advanced JavaScript (Scope (Decorations (assignment (LHS, RHS: No…
Advanced JavaScript
Scope
function scope, block scope
Decorations
var, function, value assignment. (the order also implies which one gets executed first)
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Hoisting
Function expression can get hosisted to the very top， function declaration's function name can, but the function itself can not
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Function expression can get hosisted to the very top， function declaration's function name can, but the function itself can not
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Cheating with Evel
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cheating with "with", this is not allowed when "strict" mode is on.
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Dynamic Scope: Check the call stack, it happens during run time
"this"
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explicit binding: .f.call(obj) .f.apply(obj, [])
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hard binding: fn.bind(fn, obj)
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OO
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method shadowing: create a same name method down to the prototype chain, it will be called instead of the one from parent
explicit polymorphism
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if the name is different, we can delegate the method call to it and call the parent method from the prototype chain.
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prototype = {} is evil, it throws away things
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Intro
Async Patterns
callbacks
Uncertainty of Callback sequence and return values by giving control to someone else-> Callback hell
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generators
solution: generator (es6) yield null, next()
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Closure
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Closure is when a fucntion "remembers" its lexical scope even when the function is executed outside that lexical scope.
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var foo = function bar(){} function name bar is only with its own scope. It can be referenced in side of the function. :check:
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