export function makeArray<V>(original: Array<V> | null = null): Array<V> {

if (original) {

let cloned = new Array<V>(original.length);

for (let i = 0, k = original.length; i < k; ++i) unchecked(cloned[i] = original[i]);

return cloned;

}

return new Array<V>();

}

export function makeSet<V>(original: Set<V> | null = null): Set<V> {

if (original) {

let cloned = new Set<V>();

for (let v of original) cloned.add(v);

return cloned;

}

return new Set<V>();

}

export function makeMap<K,V>(original: Map<K,V> | null = null): Map<K,V> {

if (original) {

let cloned = new Map<K,V>();

for (let [k, v] of original) cloned.set(k, v);

return cloned;

}

return new Map<K,V>();

}