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Add baseWhile and createBaseEach.

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jdalton
2015-03-21 22:07:19 -07:00
parent f26886acb0
commit 8930e6b393
1 changed files with 61 additions and 59 deletions
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120
lodash.src.js
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@@ -2025,21 +2025,7 @@
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array|Object|string} Returns `collection`.
*/
function baseEach(collection, iteratee) {
var length = collection ? collection.length : 0;
if (!isLength(length)) {
return baseForOwn(collection, iteratee);
}
var index = -1,
iterable = toObject(collection);
while (++index < length) {
if (iteratee(iterable[index], index, iterable) === false) {
break;
}
}
return collection;
}
var baseEach = createBaseEach(baseForOwn);
/**
* The base implementation of `_.forEachRight` without support for callback
@@ -2050,19 +2036,7 @@
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array|Object|string} Returns `collection`.
*/
function baseEachRight(collection, iteratee) {
var length = collection ? collection.length : 0;
if (!isLength(length)) {
return baseForOwnRight(collection, iteratee);
}
var iterable = toObject(collection);
while (length--) {
if (iteratee(iterable[length], length, iterable) === false) {
break;
}
}
return collection;
}
var baseEachRight = createBaseEach(baseForOwnRight, true);
/**
* The base implementation of `_.every` without support for callback
@@ -2858,6 +2832,27 @@
return result;
}
/**
* The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
* and `_.takeWhile` without support for callback shorthands and `this` binding.
*
* @private
* @param {Array} array The array to query.
* @param {Function} predicate The function invoked per iteration.
* @param {boolean} [isDrop] Specify dropping elements instead of taking them.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Array} Returns the slice of `array`.
*/
function baseWhile(array, predicate, isDrop, fromRight) {
var length = array.length,
index = fromRight ? length : -1;
while ((fromRight ? index-- : ++index < length) && predicate(array[index], index, array)) {}
return isDrop
? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
: baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
}
/**
* The base implementation of `wrapperValue` which returns the result of
* performing a sequence of actions on the unwrapped `value`, where each
@@ -3095,7 +3090,6 @@
* **Note:** This function is used to create `_.countBy`, `_.groupBy`, `_.indexBy`,
* and `_.partition`.
*
*
* @private
* @param {Function} setter The function to set keys and values of the accumulator object.
* @param {Function} [initializer] The function to initialize the accumulator object.
@@ -3168,6 +3162,32 @@
};
}
/**
* Creates a `baseEach` or `baseEachRight` function.
*
* @private
* @param {Function} eachFunc The function to iterate over a collection.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Function} Returns the new base function.
*/
function createBaseEach(eachFunc, fromRight) {
return function(collection, iteratee) {
var length = collection ? collection.length : 0;
if (!isLength(length)) {
return eachFunc(collection, iteratee);
}
var index = fromRight ? length : -1,
iterable = toObject(collection);
while ((fromRight ? index-- : ++index < length)) {
if (iteratee(iterable[index], index, iterable) === false) {
break;
}
}
return collection;
};
}
/**
* Creates a base function for `_.forIn` or `_.forInRight`.
*
@@ -4680,13 +4700,9 @@
* // => ['barney', 'fred', 'pebbles']
*/
function dropRightWhile(array, predicate, thisArg) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
predicate = getCallback(predicate, thisArg, 3);
while (length-- && predicate(array[length], length, array)) {}
return baseSlice(array, 0, length + 1);
return (array && array.length)
? baseWhile(array, getCallback(predicate, thisArg, 3), true, true)
: [];
}
/**
@@ -4739,14 +4755,9 @@
* // => ['barney', 'fred', 'pebbles']
*/
function dropWhile(array, predicate, thisArg) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
var index = -1;
predicate = getCallback(predicate, thisArg, 3);
while (++index < length && predicate(array[index], index, array)) {}
return baseSlice(array, index);
return (array && array.length)
? baseWhile(array, getCallback(predicate, thisArg, 3), true)
: [];
}
/**
@@ -5536,13 +5547,9 @@
* // => []
*/
function takeRightWhile(array, predicate, thisArg) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
predicate = getCallback(predicate, thisArg, 3);
while (length-- && predicate(array[length], length, array)) {}
return baseSlice(array, length + 1);
return (array && array.length)
? baseWhile(array, getCallback(predicate, thisArg, 3), false, true)
: [];
}
/**
@@ -5595,14 +5602,9 @@
* // => []
*/
function takeWhile(array, predicate, thisArg) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
var index = -1;
predicate = getCallback(predicate, thisArg, 3);
while (++index < length && predicate(array[index], index, array)) {}
return baseSlice(array, 0, index);
return (array && array.length)
? baseWhile(array, getCallback(predicate, thisArg, 3))
: [];
}
/**