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index.js
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index.js
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class Rate {
#data;
constructor(...data) {
if (typeof data !== "object")
throw new Error("data must be array or object");
data = data.flat();
this.#data = data.filter(
(item, index, self) =>
index === self.findIndex((t) => t.value === item.value)
);
if (data.length === 0) return;
//remove duplicate
if (data.filter((item) => item.rate > 100 || item.rate <= 0).length > 0)
throw new Error("rate must be 0.1 or higher than 100");
if (data.filter((item) => item.rate).length !== data.length)
throw new Error("require rate property");
if (data.filter((item) => item.value).length !== data.length)
throw new Error("require value property");
if (
data.filter(
(item) =>
typeof item.value === "number" || typeof item.value === "string"
).length !== data.length
)
throw new Error("value must be string or number");
if (
data.filter((item) => typeof item.rate === "number").length !==
data.length
)
throw new Error("rate must be number");
}
get value() {
let data = this.#data;
var total = 0;
for (var i = 0; i < data.length; i++) {
total += data[i].rate;
}
var random = Math.random() * total;
var current = 0;
for (var i = 0; i < data.length; i++) {
current += data[i].rate;
if (random <= current) {
return data[i].value;
}
}
}
push(...data) {
data = data.flat();
if (!Array.isArray(data) && typeof data !== "object")
throw new Error("data must be array or object");
if (typeof data === "object" && !Array.isArray(data)) data = [data];
if (data.filter((item) => item.rate > 100 || item.rate <= 0).length > 0)
throw new Error("rate must be 0.1 or higher than 100");
if (data.filter((item) => item.rate).length !== data.length)
throw new Error("require rate property");
if (data.filter((item) => item.value).length !== data.length)
throw new Error("require value property");
if (
data.filter(
(item) =>
typeof item.value === "number" || typeof item.value === "string"
).length !== data.length
)
throw new Error("value must be string or number");
if (
data.filter((item) => typeof item.rate === "number").length !==
data.length
)
throw new Error("rate must be number");
this.#data.push(...data);
//remove duplicate
this.#data = this.#data
.filter((r) => r)
.filter((item, index, self) => {
if (index === self.findIndex((t) => t.value === item.value)) {
if (data.find((t) => t.value === item.value)) {
this.#data[self.findIndex((t) => t.value === item.value)].rate =
data.find((t) => t.value === item.value).rate;
}
return true;
}
});
return this.#data;
}
delete(...values) {
if (values.length === 0) throw new Error("require values");
for (let i = 0; i < values.length; i++) {
var index = this.#data.findIndex((item) => item.value === values[i]);
if (index === -1) return this.#data;
this.#data.splice(index, 1);
}
return this.#data;
}
get data() {
return this.#data;
}
}
module.exports = Rate;