Stylus中文
哈希(Hashes)
In 0.39.0 version Stylus got hash objects.
Define
You can define a hash using the curly braces and colons to divide the keys and values:
foo = {
bar: baz,
baz: raz
}
foo = {
bar: baz,
baz: raz
}
the keys should be either proper idents or strings:
foo = {
bar: baz,
'baz': raz,
'0': raz
}
foo = {
bar: baz,
'baz': raz,
'0': raz
}
When you already have a hash, you can set its values using brackets and strings inside:
foo = {}
foo['bar'] = baz
foo['baz'] = raz
foo = {}
foo['bar'] = baz
foo['baz'] = raz
Note that while you can't use variables or interpolations in curly braces defines, you can use variables inside brackets:
foo = {}
bar = 'baz'
foo[bar] = raz
foo.baz
// => raz
foo = {}
bar = 'baz'
foo[bar] = raz
foo.baz
// => raz
Anonymous hash
We can create anonymous hash objects for list, a kind object with out variable name.
list = foo {int: 1, str: '1'} {node: a-node, color: #32E}
list[0]
// => foo
type(list[0])
// => 'ident'
type(list[1])
// => 'object'
list[1].int
// => 1
list[2].color
// => #32E
list = foo {int: 1, str: '1'} {node: a-node, color: #32E}
list[0]
// => foo
type(list[0])
// => 'ident'
type(list[1])
// => 'object'
list[1].int
// => 1
list[2].color
// => #32E
To access its values, we can use both brackets syntax (['str']) and dot syntax (.). Brackets syntax works well for programming, meanwhile dot syntax is more readable and JSON-alike syntax. It works well with iteration and conditional statement as well.
Getters
For retrieving values from hashes you can use the dot for idents:
foo = { bar: "baz" }
foo.bar
// => "baz"
foo = { bar: "baz" }
foo.bar
// => "baz"
Or brackets with strings for anything:
foo = { "%": 10 }
baz = "%"
foo[baz]
// => 10
foo = { "%": 10 }
baz = "%"
foo[baz]
// => 10
You can use any combinations you want:
foo = {
bar: {
baz: {
raz: 10px
}
}
}
qux = "raz"
foo["bar"].baz[qux]
// => 10px
foo = {
bar: {
baz: {
raz: 10px
}
}
}
qux = "raz"
foo["bar"].baz[qux]
// => 10px
Interpolation
Hashes used inside an interpolation would output the content of the hashes as CSS (without almost any Stylus features though):
foo = {
width: 10px,
height: 20px,
'&:hover': {
padding: 0
}
}
.bar
{foo}
// => .bar {
// width: 10px;
// height: 20px;
// }
// .bar:hover {
// padding: 0;
// }
foo = {
width: 10px,
height: 20px,
'&:hover': {
padding: 0
}
}
.bar
{foo}
// => .bar {
// width: 10px;
// height: 20px;
// }
// .bar:hover {
// padding: 0;
// }
Other stuff
You can use other normal Stylus stuff with hashes, like length():
foo = { bar: 'a', baz: 'b' }
length(foo)
// => 2
foo = { bar: 'a', baz: 'b' }
length(foo)
// => 2
You can iterate through hashes with optional key param:
foo = { width: 10px, height: 20px }
for key, value in foo
{key}: value
// => width: 10px;
// height: 20px;
foo = { width: 10px, height: 20px }
for key, value in foo
{key}: value
// => width: 10px;
// height: 20px;
You can check existence of a key in hash using in:
foo = { bar: 10px}
bar in foo
// => true
baz in foo
// => false
foo = { bar: 10px}
bar in foo
// => true
baz in foo
// => false
You can get keys or values of the hash using corresponding bifs:
foo = { bar: 'a', baz: 'b' }
keys(foo)
// => 'bar' 'baz'
values(foo)
// => 'a' 'b'
foo = { bar: 'a', baz: 'b' }
keys(foo)
// => 'bar' 'baz'
values(foo)
// => 'a' 'b'
You can remove a key from the hash using remove bif:
obj = { foo: 1, bar: 2 }
remove(obj, 'foo')
// => {"bar":"(2)"}
obj = { foo: 1, bar: 2 }
remove(obj, 'foo')
// => {"bar":"(2)"}
And you can use merge (aliased as extend) to merge hashes:
obj = {
foo: 'foo'
bar: 'bar'
}
obj2 = {
baz: 'baz'
}
merge(obj, obj2)
// => {"foo":"('foo')","bar":"('bar')","baz":"('baz')"}
obj = {
foo: 'foo'
bar: 'bar'
}
obj2 = {
baz: 'baz'
}
merge(obj, obj2)
// => {"foo":"('foo')","bar":"('bar')","baz":"('baz')"}