使用 faker js 時是單一純值不能產生結構，需要自己手動組合結構，此專案利用撰寫設定檔的方式來產生一個特定的假資料函數，減少手動組合結構的麻煩。
const test = {
type: 'obj',
content: {
name: {
type: 'value',
generateFn: () => 'hello',
},
list: {
type: 'arr',
len: 5,
item: {
type: 'value',
generateFn: () => 10,
},
},
},
};
const generateFn = createGeneratorByType(test);
console.log(generateFn());
/*
{
name: "hello"
list: [10, 10, 10, 10, 10,]
}
*/const generateFn = createValueGenerator({
type: 'value',
generateFn: () => 10,
})
console.log(generateFn());
// 10const generateFn = createSelectionGenerator({
type: 'select',
items: [1, 2, 3, 4, 5],
})
console.log(generateFn());
// 1 or 2 or 3 or 4 or 5const generateFn = createObjectGenerator({
type: 'obj',
content: {
name: {
type: 'value',
generateFn: () => 'hello',
},
list: {
type: 'arr',
len: 5,
item: {
type: 'value',
generateFn: () => 10,
}
}
}
})
console.log(generateFn());
// {
// name: 'hello',
// list: [10, 10, 10, 10, 10]
// }const generateFn = createArrayGenerator({
type: 'arr',
len: 5,
item: {
type: 'value',
generateFn: () => 10,
}
})
console.log(generateFn());
// [10, 10, 10, 10, 10]const generateFn = createTupleGenerator({
type: 'tuple',
configItems: [
{
type: 'value',
generateFn: () => 10,
},
{
type: 'value',
generateFn: () => 'hello',
},
]
})
console.log(generateFn());
// [10, 'hello']const generateFn = createBoundedSeriesGenerator({
type: 'bounded_series',
upperLimit: 1.1,
lowerLimit: 0.9,
createInitValue: () => 100,
count: 20
})
console.log(generateFn());
// [100 * 0.9 <= num <= 100 * 1.1,
// prev * 0.9 <= num <= prev * 1.1,
// prev * 0.9 <= num <= prev * 1.1,
// ...] 一切的值皆由 value 產生，可以自己創建各種不同亂數函數
flowchart TB
value --> int
value --> float
value --> string
value --> email
value --> other[...]
但並不是所有人情況都能自己手動建立函數，有可能是開放給別人使用的服務，沒辦法在使用方建立函數，這時 createGeneratorByType 第二個可以讓製作服務的人帶入自己的擴充，這樣這個函數就能接受更多種型態。
const createIntValueConfig = (option) => createValueConfig(() => faker.number.int(option));
const createEmailValueConfig = (option) => createValueConfig(() => faker.internet.email(option));
const customTypeMatch = (config) => {
if (config.type === "int") {
return createIntValueConfig(config.option);
}
if (config.type === "email") {
return createEmailValueConfig(config.option);
}
throw Error("error");
};
const config = {
type: "obj",
content: {
name: { type: "value", generateFn: () => "John" },
age: { type: "int" },
email: { type: "email" },
},
};
const result = createGeneratorByType(config, customTypeMatch)();
console.log(result);
/*
{
name: "John",
age: 50,
email: "xxx@example.com",
}
*/