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Add createRange.

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This commit is contained in:
John-David Dalton
2016-01-05 07:59:28 -08:00
parent 7fefa954c8
commit 150511b263
1 changed files with 27 additions and 32 deletions
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59
lodash.js
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@@ -4308,6 +4308,31 @@
return wrapper; return wrapper;
} }
/**
* 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;
}
start = toNumber(start);
start = start === start ? start : 0;
if (end === undefined) {
end = start;
start = 0;
} else {
end = toNumber(end) || 0;
}
step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0);
return baseRange(start, end, step, fromRight);
};
}
/** /**
* Creates a function that wraps `func` to continue currying. * Creates a function that wraps `func` to continue currying.
* *
@@ -13441,22 +13466,7 @@
* _.range(0); * _.range(0);
* // => [] * // => []
*/ */
function range(start, end, step) { var range = createRange();
if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
end = step = undefined;
}
start = toNumber(start);
start = start === start ? start : 0;
if (end === undefined) {
end = start;
start = 0;
} else {
end = toNumber(end) || 0;
}
step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0);
return baseRange(start, end, step);
}
/** /**
* This method is like `_.range` except that it populates values in * This method is like `_.range` except that it populates values in
@@ -13492,22 +13502,7 @@
* _.rangeRight(0); * _.rangeRight(0);
* // => [] * // => []
*/ */
function rangeRight(start, end, step) { var rangeRight = createRange(true);
if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
end = step = undefined;
}
start = toNumber(start);
start = start === start ? start : 0;
if (end === undefined) {
end = start;
start = 0;
} else {
end = toNumber(end) || 0;
}
step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0);
return baseRange(start, end, step, true);
}
/** /**
* Invokes the iteratee function `n` times, returning an array of the results * Invokes the iteratee function `n` times, returning an array of the results