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const {stringify} = (() => { | |
const separator = () => ','; | |
const processChar = (char) => { | |
switch (char) { | |
case '\\': | |
return '\\\\'; | |
case '\n': | |
return '\\n'; | |
case '\t': | |
return '\\t'; | |
case '\v': | |
return '\\v'; | |
case '\b': | |
return '\\b'; | |
case '\r': | |
return '\\r'; | |
case '"' : | |
return '\\"'; | |
default: | |
return char; | |
} | |
}; | |
const quote = (str) => { | |
return `"${str}"`; | |
}; | |
const processString = (str, i, res) => { | |
return str.length === i ? res : processString(str, i + 1, res + processChar(str[i])); | |
} | |
const processArray = (arr) => { | |
let str = '['; | |
for (let i = 0; i < arr.length; i++) { | |
if(i!==0) { | |
str += separator(); | |
} | |
str += stringifyCore(arr[i]); | |
} | |
return str + ']'; | |
}; | |
const stringifyCore = (v) => { | |
const t = typeof v; | |
switch (t) { | |
case 'boolean': | |
return v.toString(); | |
case 'number': { | |
if (v === 0) { | |
// -0 | |
return '0'; | |
} | |
if (isNaN(v)) { | |
return 'null'; | |
} | |
if (!isFinite(v)) { | |
return 'null'; | |
} | |
return v.toString(); | |
} | |
case 'object': | |
if (Array.isArray(v)) { | |
return processArray(v); | |
} else { | |
return 'null'; | |
} | |
case 'string': | |
return quote(processString(v, 0, '')); | |
default: | |
// unknown | |
return 'null'; | |
} | |
}; | |
const stringify = (v) => { | |
return stringifyCore(v); | |
} | |
return {stringify}; | |
})(); |
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// const a = [1, "ab\"c", true, undefined, null, _=>3, Symbol()]; | |
// JSON.stringify(a) === arrayStringify(a);가 되도록 arrayStringify를 구현 | |
// [1,"ab\"c",true,null,null,null,null] | |
const {stringify} = (() => { | |
const separator = () => ','; | |
const processChar = (char) => { | |
switch (char) { | |
case '\\': | |
return '\\\\'; | |
case '\n': | |
return '\\n'; | |
case '\t': | |
return '\\t'; | |
case '\v': | |
return '\\v'; | |
case '\b': | |
return '\\b'; | |
case '\r': | |
return '\\r'; | |
case '"' : | |
return '\\"'; | |
default: | |
return char; | |
} | |
}; | |
const quote = (str) => { | |
return `"${str}"`; | |
}; | |
const processString = (str, i, res) => { | |
return str.length === i ? res : processString(str, i + 1, res + processChar(str[i])); | |
} | |
const processArray = (arr, i, str) => { | |
if (i === 0) str += '[' | |
if (arr.length === i) return str + ']'; | |
return processArray(arr, i + 1, str + (i === 0 ? '' : separator()) + stringifyCore(arr[i])); | |
}; | |
const stringifyCore = (v) => { | |
const t = typeof v; | |
switch (t) { | |
case 'boolean': | |
return v.toString(); | |
case 'number': { | |
if (v === 0) { | |
// -0 | |
return '0'; | |
} | |
if (isNaN(v)) { | |
return 'null'; | |
} | |
if (!isFinite(v)) { | |
return 'null'; | |
} | |
return v.toString(); | |
} | |
case 'object': | |
if (Array.isArray(v)) { | |
return processArray(v, 0, ''); | |
} else { | |
return 'null'; | |
} | |
case 'string': | |
return quote(processString(v, 0, '')); | |
default: | |
// unknown | |
return 'null'; | |
} | |
}; | |
const stringify = (v) => { | |
return stringifyCore(v, ''); | |
} | |
return {stringify}; | |
})(); | |
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네. 여전히 그걸 해결하기 위해 스택을 제거할 수 없으니까요. 꼬리재귀는 1강 반복