I brought FlashCards to take notes so I have a little bit more to report on the blog.
this
– the magic keyword ‘this’.
– In one sentence, ‘this’ always refers to “at run time”, the left side of the dot, of the function where ‘this’ was invoked.
– Exceptions are when there is nothing to the left of the dot, ‘this’ refers to ‘window’
Other tips:
– the prototype chains. Pass by reference. Object.protoype is the top level and there is nothing above that.
– _.uniq() might be a common question in interviews
– Object.prototype.toString.call() will return [object Object], [object Array], [object Arguments] depending on what parameters are being passed in
– http://jsparse.meteor.com/ is a really visualization cool tool to show how your js code is being parsed
– array.reverse()
– typeof n === ‘undefined’
– In underscore, most of the time, the iterator takes three parameters, i.e. _.iterator(value, key, collection). Notable exceptions are _.reduce(function(memo, value, key, collection){})
– git commit every 5 to 10 lines
– Array.isArray() is not always working depending on the environment
– _.delay() doesn’t have the ability to pass a context as a parameter
– apply() vs call()