wtfjs
15 Feb 2010 |
|
javascript
humour
javascript
humour
wtfjs is a blog of JavaScript’s irregularities, inconstancies and unintuitive aspects. The author posts humorous code snippets which are similar to the bad parts from Crockford’s JavaScript: The Good Parts.
Other than the obvious examples based around the confusing nature of falsy and NaN, there are some interesting examples that might test your knowledge of JavaScript:
("foo" + + "bar") === "fooNaN"
(x=[].reverse)() === window // true
Am I suffering from a kind of blindness due to writing JavaScript for too long, or does the following make sense?
"string" instanceof String; // false
(new String("string")) instanceof String; // true
Of course it’s false, it’s a string literal rather than an instance of String! Is it useful to distinguish between string literals and instances of String?
