deep-iterator
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Deep iteration of any object or iterable collection.
208 lines (207 loc) • 5.71 kB
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<a href="../index.html">all files</a> / <a href="index.html">src/</a> seen.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">class NoCheckSeen {
add() {return this}
has() {return false}
}
// TODO : use an immutable collection
class LeafSeen {
constructor(arr) {
this._arr = arr;
}
add(value) {
return new LeafSeen([...this._arr, value]);
}
has(value) {
return this._arr.includes(value);
}
}
// TODO : use an immutable collection
class ThrowSeen {
constructor(arr) {
this._arr = arr;
}
add(value) {
return new ThrowSeen([...this._arr, value]);
}
has(value) {
if (this._arr.includes(value)) {
throw new Error(`Circular reference : ${value}`);
}
return false;
}
}
export default function makeSeen(circularReference) {
switch (circularReference) {
case 'leaf': return new LeafSeen([]);
case 'throw': return new ThrowSeen([]);
case 'noCheck': return new NoCheckSeen();
}
throw new Error(`Incorrect value ${circularReference} for circularReference option.`);
}
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