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export function checkedIndexOf<T>(o: T | number, arr: T[], type: string = "object"): number {
let idx: number;
if (typeof o === "number") {
idx = o;
} else if (typeof (o as any).id === "number") {
idx = (o as any).id;
} else {
idx = arr.indexOf(o);
}
if (idx < 0 || idx > arr.length) {
throw new Error(`Invalid ${type} specified: ${o}`);
}
return idx;
}
export function getRandomId() {
return Math.floor(Math.random() * 1000000000);
}