We will write several utility functions in lib/game/utils.ts. With flatten, we will transform an array of arrays into one array.
export function flatten<U>(source: U[][]): U[] {
return (<U[]>[]).concat(...source);
}
With update, we can modify some properties of an object. This is the same function as in previous chapters.
export function update<U extends V, V>(old: U, changes: V): U {
const result = Object.create(Object.getPrototypeOf(old));
for (const key of Object.keys(old)) {
result[key] = (<any> old)[key];
}
for (const key of Object.keys(changes)) {
result[key] = (<any> changes)[key];
}
return result;
}
Next, we will create a function for working with Math.random. randomInt will return a random integer in a certain range and chance has a chance to return true:
export function randomInt(min: number, max: number) {
return min +...