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CombinationIterator.js
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CombinationIterator.js
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//From 1286 in LeetCode
/**
* @param {string} characters
* @param {number} combinationLength
*/
class CombinationIterator {
constructor(characters, combinationLength) {
let iterations = [];
function recursion(array, dictionary) {
if (array.length === combinationLength) {
iterations.push(array.join(''));
return;
}
for (let i = 0; i < dictionary.length; i++) {
let current = dictionary[i];
let copy = array.slice();
copy.push(current);
recursion(copy, dictionary.slice(i + 1));
}
}
recursion([], characters.split(''));
this.iterations = iterations;
}
}
/**
* @return {string}
*/
CombinationIterator.prototype.next = function() {
return this.iterations.shift();
};
/**
* @return {boolean}
*/
CombinationIterator.prototype.hasNext = function() {
return this.iterations.length > 0;
};
/**
* Your CombinationIterator object will be instantiated and called as such:
* var obj = new CombinationIterator(characters, combinationLength)
* var param_1 = obj.next()
* var param_2 = obj.hasNext()
*/