Javascript

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By Paul Grice

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You’ll notice that the self-reference this returned from the embedded fun function returns the object a itself. This is probably what you would expect. fun(); //=> some global object, probably Window Well, this is surprising. You see, when a function is created outside of the context of an object instance, its this reference points to the global object. fun, its reference was never updated to b itself. In most programming languages offering both functional and object-oriented styles, a trade-off is made in the way that self-reference is handled.

27 to this book. 2 The term “first-class” means that something is just a value. A first-class function is one that can go anywhere that any other value can go—there are few to no restrictions. A number in JavaScript is surely a first-class thing, and therefore a first-class function has a similar nature: • A number can be stored in a variable and so can a function: var fortytwo = function() { return 42 }; • A number can be stored in an array slot and so can a function: var fortytwos = [42, function() { return 42 }]; • A number can be stored in an object field and so can a function: var fortytwos = {number: 42, fun: function() { return 42 }}; • A number can be created as needed and so can a function: 42 + (function() { return 42 })(); //=> 84 • A number can be passed to a function and so can a function: function weirdAdd(n, f) { return n + f() } weirdAdd(42, function() { return 42 }); //=> 84 • A number can be returned from a function and so can a function: return 42; return function() { return 42 }; The last two points define by example what we would call a “higher-order” function; put directly, a higher-order function can do one or both of the following: • Take a function as an argument • Return a function as a result 2.

Another way of viewing a JavaScript object is as an array of arrays, each holding a key and a value. invert(zombie); //=> {"Bub": "name", "Day of the Dead": "film"} It’s worth mentioning that unlike in many other languages, JavaScript object keys can only ever be strings. defaults function to ensure that the author field contains a useful value (rather than undefined). pick takes a whitelist to take keys (both nondestructively). where. where(library, {title: "SICP"}); //=> [{title: "SICP", isbn: "0262010771", ed: 1}, // {title: "SICP", isbn: "0262510871", ed: 2}] This type of usage pattern points to a very important data abstraction: the table.

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Actions and Events by Paul Grice


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