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Optimize lazy evaluation for 1 param.

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jdalton
2015-02-28 10:11:26 -08:00
parent 973038da6a
commit 132aacee89
2 changed files with 26 additions and 32 deletions
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46
lodash.src.js
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@@ -34,9 +34,10 @@
HOT_SPAN = 16;
/** Used to indicate the type of lazy iteratees. */
var LAZY_FILTER_FLAG = 0,
LAZY_MAP_FLAG = 1,
LAZY_WHILE_FLAG = 2;
var LAZY_DROP_WHILE_FLAG = 0,
LAZY_FILTER_FLAG = 1,
LAZY_MAP_FLAG = 2,
LAZY_TAKE_WHILE_FLAG = 3;
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
@@ -1292,16 +1293,22 @@
while (++iterIndex < iterLength) {
var data = iteratees[iterIndex],
iteratee = data.iteratee,
computed = iteratee(value, index, array),
type = data.type;
if (type != LAZY_DROP_WHILE_FLAG) {
var computed = iteratee(value);
} else {
data.done = data.done && (isRight ? index < data.index : index > data.index);
data.index = index;
computed = data.done || (data.done = !iteratee(value));
}
if (type == LAZY_MAP_FLAG) {
value = computed;
} else if (!computed) {
if (type == LAZY_FILTER_FLAG) {
continue outer;
} else {
if (type == LAZY_TAKE_WHILE_FLAG) {
break outer;
} else {
continue outer;
}
}
}
@@ -11482,15 +11489,15 @@
});
// Add `LazyWrapper` methods that accept an `iteratee` value.
arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
var isFilter = index == LAZY_FILTER_FLAG || index == LAZY_WHILE_FLAG;
arrayEach(['dropWhile', 'filter', 'map', 'takeWhile'], function(methodName, type) {
var isFilter = type != LAZY_MAP_FLAG;
LazyWrapper.prototype[methodName] = function(iteratee, thisArg) {
var result = this.clone(),
iteratees = result.__iteratees__ || (result.__iteratees__ = []);
result.__filtered__ = result.__filtered__ || isFilter;
iteratees.push({ 'iteratee': getCallback(iteratee, thisArg, 1), 'type': index });
iteratees.push({ 'done': false, 'index': 0, 'iteratee': getCallback(iteratee, thisArg, 1), 'type': type });
return result;
};
});
@@ -11555,23 +11562,10 @@
return this.filter(identity);
};
LazyWrapper.prototype.dropWhile = function(predicate, thisArg) {
var done,
lastIndex,
isRight = this.__dir__ < 0;
predicate = getCallback(predicate, thisArg, 1);
return this.filter(function(value, index, array) {
done = done && (isRight ? index < lastIndex : index > lastIndex);
lastIndex = index;
return done || (done = !predicate(value, index, array));
});
};
LazyWrapper.prototype.reject = function(predicate, thisArg) {
predicate = getCallback(predicate, thisArg, 1);
return this.filter(function(value, index, array) {
return !predicate(value, index, array);
return this.filter(function(value) {
return !predicate(value);
});
};
@@ -11593,7 +11587,7 @@
// Add `LazyWrapper` methods to `lodash.prototype`.
baseForOwn(LazyWrapper.prototype, function(func, methodName) {
var lodashFunc = lodash[methodName],
checkIteratee = /(?:filter|map|reject|While)/.test(methodName),
checkIteratee = /^(?:filter|map|reject)|While$/.test(methodName),
retUnwrapped = /^(?:first|last)$/.test(methodName);
lodash.prototype[methodName] = function() {

12
test/test.js
View File

@@ -3994,7 +3994,7 @@
args = slice.call(arguments);
}).value();
deepEqual(args, [16, 3, array]);
deepEqual(args, [16]);
_(array).map(square).dropRightWhile(function() {
args = slice.call(arguments);
@@ -4095,7 +4095,7 @@
args = slice.call(arguments);
}).value();
deepEqual(args, [1, 0, array]);
deepEqual(args, [1]);
_(array).map(square).dropWhile(function() {
args = slice.call(arguments);
@@ -4929,7 +4929,7 @@
args = slice.call(arguments);
}).value();
deepEqual(args, [16, 3, array]);
deepEqual(args, [16]);
_(array).map(square).takeRightWhile(function() {
args = slice.call(arguments);
@@ -5029,7 +5029,7 @@
args = slice.call(arguments);
}).value();
deepEqual(args, [1, 0, array]);
deepEqual(args, [1]);
_(array).map(square).takeWhile(function() {
args = slice.call(arguments);
@@ -9199,7 +9199,7 @@
args || (args = slice.call(arguments));
}).value();
deepEqual(args, [1, 0, array]);
deepEqual(args, [1]);
args = null;
_(array).map(square).map(function() {
@@ -12186,7 +12186,7 @@
args || (args = slice.call(arguments));
}).value();
deepEqual(args, [1, 0, array]);
deepEqual(args, [1]);
args = null;
_(array).map(square)[methodName](function() {