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