Comments (2)
取巧的方案
/**
* @param {string} str
* @return {object | Array | string | number | boolean | null}
*/
function parse(str) {
let result = (new Function(`return ${str.replace(/\"/g,"'")}`))();
if(str !== JSON.stringify(result)) {
throw new Error("Nope");
}
return result;
}
from fe-questions.
实现 stringify
/**
* @param {any} data
* @return {string}
*/
function stringify(data) {
if(typeof data === 'bigint') {
throw new Error('Do not know how to serialize a BigInt at JSON.stringify');
}
if(typeof data === 'string') {
return `"${data}"`;
}
if(typeof data === 'function') {
return undefined;
}
if(data !== data) {
return 'null';
}
if(data === Infinity) {
return 'null';
}
if(data === -Infinity) {
return 'null';
}
if(typeof data === 'number') {
return `${data}`;
}
if(typeof data === 'boolean') {
return `${data}`;
}
if(data === null) {
return 'null';
}
if(data === undefined) {
return 'null';
}
if(typeof data === 'symbol') {
return 'null';
}
if(data instanceof Date) {
return `"${data.toISOString()}"`;
}
if(Array.isArray(data)) {
const arr = data.map((el) => stringify(el));
return `[${arr.join(',')}]`;
}
if(typeof data === 'object') {
const arr = Object.entries(data).reduce((acc, [key, value]) => {
if(value === undefined) {
return acc;
}
acc.push(`"${key}":${stringify(value)}`);
return acc;
}, [])
return `{${arr.join(',')}}`;
}
}
from fe-questions.
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