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45 lines
756 B
45 lines
756 B
/**
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* Obliterator Range Function
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* ===========================
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*
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* Function returning a range iterator.
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*/
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var Iterator = require('./iterator.js');
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/**
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* Range.
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*
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* @param {number} start - Start.
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* @param {number} end - End.
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* @param {number} step - Step.
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* @return {Iterator}
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*/
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module.exports = function range(start, end, step) {
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if (arguments.length === 1) {
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end = start;
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start = 0;
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}
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if (arguments.length < 3) step = 1;
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var i = start;
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var iterator = new Iterator(function () {
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if (i < end) {
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var value = i;
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i += step;
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return {value: value, done: false};
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}
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return {done: true};
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});
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iterator.start = start;
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iterator.end = end;
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iterator.step = step;
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return iterator;
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};
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