此函数的目标是验证密钥。如果键匹配且不存在其他键，则应返回 true。如果没有匹配的键或者它们小于预期的键，它应该返回 false。该函数validateKeys(object, expectedKeys)应该返回true或false一般。我贴了详细code的给你看程序流程//running the function with `objectA` and `expectedKeys`// should return `true`const objectA = { id: 2, name: 'Jane Doe', age: 34, city: 'Chicago',};// running the function with `objectB` and `expectedKeys`// should return `false`const objectB = { id: 3, age: 33, city: 'Peoria',};const expectedKeys = ['id', 'name', 'age', 'city'];function validateKeys(object, expectedKeys) { // your code goes here for (let i=0; i<expectedKeys.length;i++) { if (Object.keys(object).length === expectedKeys[i]) { return false; }else if (expectedKeys[i] < Object.keys(object) || Object.keys(object).length > expectedKeys[i] ) { return false; }else return; }return true;} /* From here down, you are not expected to understand.... for now :) Nothing to see here!*/function testIt() { const objectA = { id: 2, name: 'Jane Doe', age: 34, city: 'Chicago', }; const objectB = { id: 3, age: 33, city: 'Peoria', }; const objectC = { id: 9, name: 'Billy Bear', age: 62, city: 'Milwaukee', status: 'paused', }; const objectD = { foo: 2, bar: 'Jane Doe', bizz: 34, bang: 'Chicago', }; const expectedKeys = ['id', 'name', 'age', 'city']; if (typeof validateKeys(objectA, expectedKeys) !== 'boolean') { console.error('FAILURE: validateKeys should return a boolean value'); return; } if (!validateKeys(objectA, expectedKeys)) { console.error( `FAILURE: running validateKeys with the following object and keys should return true but returned false: Object: ${JSON.stringify(objectA)} Expected keys: ${expectedKeys}` ); return; }
2 回答
Qyouu
TA贡献1786条经验 获得超11个赞
您可能需要以下内容：
function validateKeys(object, expectedKeys) {
let keys = Object.keys(object);
// Check if both arrays have the same length
// if not, we can exit early
if (keys.length !== expectedKeys.length) {
return false;
}
// If they do have the same length, then let's see if they
// have all the keys, if not, return false
for (let index = 0; index < expectedKeys.length; index++) {
if (!expectedKeys.includes(keys[index])) {
return false;
};
}
// else return true, the keys are valid
return true;
}
//running the function with `objectA` and `expectedKeys`
// should return `true`
const objectA = {
id: 2,
name: "Jane Doe",
age: 34,
city: "Chicago",
};
// running the function with `objectB` and `expectedKeys`
// should return `false`
const objectB = {
id: 3,
age: 33,
city: "Peoria",
};
const expectedKeys = ["id", "name", "age", "city"];
function validateKeys(object, expectedKeys) {
let keys = Object.keys(object);
// Check if both arrays have the same length
// if not, we can exit early
if (keys.length !== expectedKeys.length) {
return false;
}
// If they do have the same length, then let's see if they
// have all the keys, if not, return false
for (let index = 0; index < expectedKeys.length; index++) {
if (!expectedKeys.includes(keys[index])) {
return false;
};
}
// else return true, the keys are valid
return true;
}
/* From here down, you are not expected to
understand.... for now :)
Nothing to see here!
*/
function testIt() {
const objectA = {
id: 2,
name: "Jane Doe",
age: 34,
city: "Chicago",
};
const objectB = {
id: 3,
age: 33,
city: "Peoria",
};
const objectC = {
id: 9,
name: "Billy Bear",
age: 62,
city: "Milwaukee",
status: "paused",
};
const objectD = {
foo: 2,
bar: "Jane Doe",
bizz: 34,
bang: "Chicago",
};
const expectedKeys = ["id", "name", "age", "city"];
if (typeof validateKeys(objectA, expectedKeys) !== "boolean") {
console.error("FAILURE: validateKeys should return a boolean value");
return;
}
if (!validateKeys(objectA, expectedKeys)) {
console.error(
`FAILURE: running validateKeys with the following object and keys
should return true but returned false:
Object: ${JSON.stringify(objectA)}
Expected keys: ${expectedKeys}`
);
return;
}
if (validateKeys(objectB, expectedKeys)) {
console.error(
`FAILURE: running validateKeys with the following object and keys
should return false but returned true:
Object: ${JSON.stringify(objectB)}
Expected keys: ${expectedKeys}`
);
return;
}
if (validateKeys(objectC, expectedKeys)) {
console.error(
`FAILURE: running validateKeys with the following object and keys
should return false but returned true:
Object: ${JSON.stringify(objectC)}
Expected keys: ${expectedKeys}`
);
return;
}
if (validateKeys(objectD, expectedKeys)) {
console.error(
`FAILURE: running validateKeys with the following object and keys
should return false but returned true:
Object: ${JSON.stringify(objectD)}
Expected keys: ${expectedKeys}`
);
return;
}
console.log("SUCCESS: validateKeys is working");
}
testIt();
慕标琳琳
TA贡献1830条经验 获得超9个赞
您正在将string(expectedKeys[i]) 与 number(length)进行比较。Javascript不会给你一个错误，但它总是会评估为假。此外，您在 for 循环中放置了一个 return，当遇到它时会中断循环。
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