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Explain anonymous functions after first-class, and more concisely

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Adam Brenecki 2013-08-14 17:21:29 +09:30
parent 02ea95377d
commit a82859f95b
1 changed files with 8 additions and 11 deletions
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19
javascript.html.markdown
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@ -211,16 +211,6 @@ function myFunction(thing){
}
myFunction("foo") // = "FOO"
// Functions can also be defined "anonymously" - without a name:
(function(thing){
return thing.toLowerCase()
})
// Note: Stand-alone function declarations require an identifier name.
// Anonymous functions are values, not declarations, so they must be
// treated as a value. We wrap ours here in ( ) to do so, or you could assign
// it to a variable, or pass it as a parameter to another function.
// (we can't call our function, since we don't have a name to refer to it with)
// JavaScript functions are first class objects, so they can be reassigned to
// different variable names and passed to other functions as arguments - for
// example, when supplying an event handler:
@ -229,9 +219,16 @@ function myFunction(){
}
setTimeout(myFunction, 5000)
// Functions can also be defined "anonymously" - without a name:
var lowerFunction = function(thing){
return thing.toLowerCase()
}
lowerFunction("Foo") // = "foo"
// (note: we've assigned our anonymous function to a variable - if we didn't, we
// wouldn't be able to access it)
// You can even write the function statement directly in the call to the other
// function.
setTimeout(function myFunction(){
// this code will be called in 5 seconds' time
}, 5000)