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31 lines
864 B
JavaScript
31 lines
864 B
JavaScript
6 years ago
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var baseRange = require('./_baseRange'),
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isIterateeCall = require('./_isIterateeCall'),
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toFinite = require('./toFinite');
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/**
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* Creates a `_.range` or `_.rangeRight` function.
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*
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* @private
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* @param {boolean} [fromRight] Specify iterating from right to left.
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* @returns {Function} Returns the new range function.
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*/
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function createRange(fromRight) {
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return function(start, end, step) {
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if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
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end = step = undefined;
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}
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// Ensure the sign of `-0` is preserved.
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start = toFinite(start);
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if (end === undefined) {
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end = start;
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start = 0;
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} else {
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end = toFinite(end);
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}
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step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
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return baseRange(start, end, step, fromRight);
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};
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}
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module.exports = createRange;
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