JSON.stringify() You Don't Know All In One
JSON.stringify() You Don't Know All In One
JSON.stringify()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
https://www.freecodecamp.org/news/json-stringify-method-explained/
demos
console.log(JSON.stringify({ x: 5, y: 6 }));
// expected output: "{"x":5,"y":6}"
console.log(JSON.stringify({ x: 5, y: 6 }, null, undefined));
console.log(JSON.stringify({ x: 5, y: 6 }, null, null));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x'], null));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], null));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], ' '));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], '👻👻'));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], 2));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], 10));
console.log(JSON.stringify({ x: 5, y: 6, z: 7, }, ['x', 'y'], 11));
/*
*/
solution
undefined => null
const autoConvertundefinedToNull = (obj, replacer = null, spaces = 4) => {
return JSON.stringify(
obj,
(k, v) => v !== undefined ? v : replacer,
spaces,
);
};
// undefined
const obj = {
"name" : "xgqfrms",
"email" : undefined,
"age" : null
};
// undefined
autoConvertundefinedToNull(obj);
/*
"{
"name": "xgqfrms",
"email": null,
"age": null
}"
*/
refs
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
https://www.cnblogs.com/xgqfrms/tag/JSON.stringify/
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