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yangtaeho/codeSpitzS89-5 과제 1

Last active April 27, 2021 12:47
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codeSpitzS89-5 과제
Raw
codeSpitzS89-5 과제 1
if ('과제 1 - generator 는 습득이 0인 것 같아요....') {
let i = 0;
const copy = iter=>{
iter.filter = (block)=>copy((function*(){
for(const v of iter){
i++;
if(block(v)) yield v;
console.log('filter skip', v);
}
})());
iter.map = (block)=>copy((function*(){
for(const v of iter){
i++;
console.log('map ', i, v);
yield block(v);
}
})());
return iter;
};
const lazyArray = iter=>copy(iter);
const f = [...lazyArray([1,2,3,4,5]).filter(v=>v%2).map(v=>v*2)];
console.log(f, i);
i = 0;
const f2 = [...lazyArray([1,2,3,4,5]).filter(v=>{console.log('filter v: ', v);return v%2;}).map(v=>{console.log('map v: ', v);return v*2;})];
console.log(f2, i);
}
Raw
codeSpitzS89-5 과제 2
const stringify89_5_210427 = (obj => {
// utils ====================================================
const isDebug =_=>!1;
const objToString = finalNode=>{
let accStr = "";
const obj = [];
let curr = finalNode;
if (isEmptyObject(curr)) {
return "{}";
}
for (const v of curr) {
if (!(v && Array.isArray(v) && v.length == 2)) {
err('invalid request. ' + v);
}
}
for (const v of curr) {
accStr += "," + v[0] + ':' + v[1];
}
return "{" + accStr.substr(1) + "}";
};
const quote = str=>`\"${str}\"`;
const _escape = {
table: [[/\"/g,'\\\"']
,[/\t/g, '\\t']
,[/[\r]/g, '\\r']
,[/[\n]/g, '\\n']
,[/[\l]/g, 'l']]
,exe(str){
let acc = str;
for (const item of this.table) {
acc = acc.replace(item[0], item[1]);
}
return acc;
}
};
const NULL_STR = 'null';
const DELIM = ',';
const el = {
table: {
"null":v=>NULL_STR
,'undefined': v=>NULL_STR
,'function': v=>NULL_STR
,'symbol': v=>NULL_STR
,'number': v=>v.toString()
,'string': v=>quote(_escape.exe(v))
,'array': v=>NULL_STR
,'object': v=>NULL_STR
,boolean: v=>v.toString()
},
stringifyRouter(item) {
if (!this.table[typeof item]) {
if (!item) {
return this.table[NULL_STR](item);
}
} else {
return this.table[typeof item](item);
}
//return (this.table[typeof item] ?? this.table[!item ? NULL_STR : Array.isArray(item) ? "array" : "object"])?.(item) ?? NULL_STR;
}
};
const err = v=>{throw v;};
//5강 끝난 후 보강
const objEntries = function*(obj){
for (const k in obj) if (obj.hasOwnProperty(k)) yield [k, obj[k]];
};
// 정답? =====
/*const objEntries = function*(obj){
for(const k in obj) if(obj.hasOwnProperty(k)) yield [k, obj[k]];
};*/
const accuToString = (acc, isObject) => { // 쌓여있는..
let [START, END] = (isObject) ? "{}" : "[]";
let result = "";
if(acc && acc.prev){
let curr = acc;
do{
result = "," + (isObject ? `"${curr.value[0]}":${el.stringifyRouter(curr.value[1])}` : el.stringifyRouter(curr.value)) + result;
}while(curr = curr.prev);
result = result.substr(1);
}
return START + result + END;
};
const recursive = (iter, isObject, accu, prev) => {
const {done, value} = iter.next();
if(!done) {
const v = isObject ? value[1] : value;
switch(true){
case Array.isArray(v):
return recursive(v[Symbol.iterator](), false, null, {target:iter, isObject, accu, k: isObject ? value[0] : '', prev: prev});
case v && typeof v == "object":
return recursive(objEntries(v), true, null, {target:iter, isObject, accu, k: isObject ? value[0] : '', prev: prev});
default:
return recursive(iter, isObject, {
prev: accu
, value
}, prev);
}
} else {
let accuStr = accuToString(accu, isObject);
console.log('debug ', accuStr);
if(prev) {
return recursive(prev.target, prev.isObject, {prev:prev.accu, value:prev.isObject ? [prev.k, accuStr] : accuStr}, prev.prev);
} else {
return accuStr;
}
}
};
const stringify =v=>recursive(Array.isArray(v) ? v[Symbol.iterator]() : objEntries(v), !Array.isArray(v), null, null);
const loop = (iter, isObject)=> {
const _err = true; // 무한루프 상태라서 막음....
if (_err) {
return "";
}
let accuStr;
let accu;
let prev;
while(true) {
const {done, value} = iter.next();
if(!done) {
const v = isObject ? value[1] : value;
switch(true){
case Array.isArray(v):
prev = {target:iter, isObject, accu, k: isObject ? value[0] : '', prev: prev};
iter = v[Symbol.iterator]();
isObject = false;
accu = null;
break;
case v && typeof v == "object":
prev = {target:iter, isObject, accu, k: isObject ? value[0] : '', prev: prev};
iter = objEntries(v);
isObject = true;
accu = null;
break;
default:
accu = {
prev: accu
, value
};
}
} else {
accuStr = accuToString(accu, isObject);
console.log('debug ', accuStr);
if(prev) {
accu = {prev:prev.accu, value:prev.isObject ? [prev.k, accuStr] : accuStr};
iter = prev.target;
isObject = prev.isObject;
} else {
break;
}
}
}
return accuStr;
};
const stringify2For =v=>loop(Array.isArray(v) ? v[Symbol.iterator]() : objEntries(v), !Array.isArray(v), null, null);
return {
stringify
, stringify2For
}
})();
const test_stringify = (f, v, isDebug = true)=>{
if (!v) return console.log(`Invalid arg. v: '${v}'`);
let logs = [`\n[s]${f['name']} ====`
, `\n\tJSON.stringify와 일치: ${f(v) == JSON.stringify(v)}`, (f(v) == JSON.stringify(v) ? '' : '!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!')
, '\n\tQ문제 ', v];
if (isDebug) logs = logs.concat([
'\n\t답안 ', f(v)
, '\n\tJSON.stingify ', JSON.stringify(v)]);
logs.push('\n[e]========');
console.log(...logs);
};
console.log('\n\n====\n\n');
test_stringify(stringify89_5_210427.stringify, []);
test_stringify(stringify89_5_210427.stringify, [1, 2, ["a", [1, 2], false], 3, ["b", "c", [1, 2]]], true);
test_stringify(stringify89_5_210427.stringify, [,'test', 1]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"c", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"\nc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"\rc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"\lc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"\r\nc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"c", true, undefined, null, _=>3, Symbol()]);
test_stringify(stringify89_5_210427.stringify, [1, "ab\"c", true, undefined, null, ["ab\"c", true, undefined, null], _=>3, Symbol()]);
test_stringify(stringify89_5_210427.stringify, {_1:3, b:"abc", 3:true, true: '5'});
test_stringify(stringify89_5_210427.stringify, {_1:[1], _3: 3, 4: '5', 6: true});
test_stringify(stringify89_5_210427.stringify, {_1:[1, "ab\"c", true, undefined, null, ["ab\"c", true, undefined, null], _=>3, Symbol()], 2: '3', '3': {_4: '5', _6: '7'}, '8': ['9', 10, {'11': '12'}]});
console.log('\n\n====\n\n');
if (false) {
test_stringify(stringify89_5_210427.stringify2For, []);
test_stringify(stringify89_5_210427.stringify2For, [1, 2, ["a", [1, 2], false], 3, ["b", "c", [1, 2]]], true);
test_stringify(stringify89_5_210427.stringify2For, [,'test', 1]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"c", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"\nc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"\rc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"\lc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"\r\nc", true, null, _=>3]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"c", true, undefined, null, _=>3, Symbol()]);
test_stringify(stringify89_5_210427.stringify2For, [1, "ab\"c", true, undefined, null, ["ab\"c", true, undefined, null], _=>3, Symbol()]);
test_stringify(stringify89_5_210427.stringify2For, {_1:3, b:"abc", 3:true, true: '5'});
test_stringify(stringify89_5_210427.stringify2For, {_1:[1], _3: 3, 4: '5', 6: true});
test_stringify(stringify89_5_210427.stringify2For, {_1:[1, "ab\"c", true, undefined, null, ["ab\"c", true, undefined, null], _=>3, Symbol()], 2: '3', '3': {_4: '5', _6: '7'}, '8': ['9', 10, {'11': '12'}]});
console.log('\n\n====\n\n');
}
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