mirror of
https://github.com/swc-project/swc.git
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96 lines
3.5 KiB
JavaScript
96 lines
3.5 KiB
JavaScript
// self - local self
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// ArrayBindingPattern -> [Elision? BindingRestElement -> BindingIdentifier]
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/*
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* ArrayBindingPattern
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* Elision = ,
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* BindingRestElement = ... SELF | ... identifier
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* BindingElementList = ,? BindingElement | self ,? BindingElement
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* BindingElement = identifier = _ | SELF = _
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*
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* */
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let simple_array = [1, 2, 3, 4, 5, 6]
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let multi_array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
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let multi_array_2 = [[[1, 2, 3, 4], [5, 6, 7, 8, 9]]]
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let obj = {
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num: 10,
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null: null,
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nested: {nested: {val: "val"}, array: simple_array},
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s_array: simple_array,
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m_array: multi_array
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}
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// ------- BindingPattern = SELF
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{
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let [...tail] = simple_array // [ 1, 2, 3, 4, 5, 6 ]
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let [, ...tail_1] = simple_array // [ 2, 3, 4, 5, 6 ]
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let [, , , ...tail_2] = simple_array // [ 4, 5, 6 ]
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// ArrayBindingPattern -> [Elision? BindingRestElement -> BindingPattern -> ArrayBindingPattern -> [Elision? BindingRestElement -> BindingIdentifier]]
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let [...[...tail_3]] = multi_array // [[ 1, 2, 3 ],[ 4, 5, 6 ],[ 7, 8, 9 ]]
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let [...[...tail_4]] = multi_array_2 // [ [ [ 1, 2, 3, 4 ], [ 5, 6, 7, 8, 9 ] ] ]
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let [...[...[...tail_5]]] = multi_array_2 // [ [ [ 1, 2, 3, 4 ], [ 5, 6, 7, 8, 9 ] ] ]
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let [, ...[, ...tail_6]] = multi_array // [ [ 7, 8, 9 ] ]
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let [, ...[, ...tail_7]] = multi_array_2 // []
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let [, ...[, , ...tail_8]] = [1, 2, 3, [4, 5, 6, 7]] // [ [ 4, 5, 6, 7 ] ]
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// ArrayBindingPattern -> [Elision? BindingRestElement -> BindingPattern -> ObjectBindingPattern ... ]
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// ArrayBindingPattern -> [BindingElementList -> BindingElisionElement -> BindingElement -> SingleNameBinding]
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let [a = 10] = simple_array // 1
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let [, ab = 10, , ,] = simple_array // 2
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let [, , , ba = ab] = simple_array // 4
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// ArrayBindingPattern -> [BindingElementList -> BindingElisionElement -> BindingElement -> BindingPattern]
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// ArrayBindingPattern -> [BindingElementList,Elision? BindingRestElement]
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let [, v1, , ...v_rest] = simple_array // 2 [ 4, 5, 6 ]
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/*
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* ObjectBindingPattern
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* {}
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* {BindingRestProperty} = ... id
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* {BindingPropertyList} = BindingProperty | self,BindingProperty
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* {BindingPropertyList,BindingRestProperty }
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* BindingProperty = id = _ | PropertyName : id = _ | PropertyName : SELF = _
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* PropertyName = ((UnicodeIDStart | $ | _ ) (UnicodeIDContinue | $ | <ZWNJ> <ZWJ> ) | "string" | 'string' | num | [ _ ]
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* */
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// ObjectBindingPattern -> {}
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let {} = obj // {}
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// ObjectBindingPattern -> {BindingRestProperty}
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let {...obj2} = obj // obj
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var {...obj3} = obj // obj
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// ObjectBindingPattern -> {BindingPropertyList}
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let {simple_prop = 10} = obj // 10
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let {obj_prop = {value: prop2 = 10}, prop3 = [1]} = obj // obj_prop = {value:10},prop2 = 10
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let {obj1 = {$: num = 10, '': sym = '', " ": quote = " ", _: under = [...tail],}} = obj // obj_prop = {value:10},prop2 = 10
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}
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// ----------------- //
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// Spots
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// PrimaryExpression -> (...SELF) | (Expression, ...SELF)
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// LexicalDeclaration[ -> (let | const) SELF
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// Iteration Statements -> for((var | let | const) SELF (in | of) ...)
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// TryStatement -> try{...} catch(SELF){...}
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class MyError extends Error {
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constructor(name1, name2) {
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super();
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this.name1 = name1;
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this.name2 = name2;
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}
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}
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try {
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let err = new MyError("name1", "name2")
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err.code = "code"
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throw err
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} catch ({name1, name2, code, ...rest}) {
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console.log(name1, name2, code, rest)
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}
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for (let [, , t] = simple_array; t < 10; t++) {
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// console.log(t)
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}
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for (let {num} = obj; num < 11; num++) {
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// console.log(num)
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} |