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Ensure _.first, _.last, and _.sample return the undefined if called with a falsey argument or an empty array if called with a falsey argument and an n value.

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John-David Dalton
2013-09-09 08:21:24 -07:00
parent fb61dfd39d
commit 21a45a940e
2 changed files with 60 additions and 38 deletions
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61
lodash.js
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@@ -4320,24 +4320,22 @@
* // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
*/
function first(array, callback, thisArg) {
if (array) {
var n = 0,
length = array.length;
var n = 0,
length = array ? array.length : 0;
if (typeof callback != 'number' && callback != null) {
var index = -1;
callback = lodash.createCallback(callback, thisArg, 3);
while (++index < length && callback(array[index], index, array)) {
n++;
}
} else {
n = callback;
if (n == null || thisArg) {
return array[0];
}
if (typeof callback != 'number' && callback != null) {
var index = -1;
callback = lodash.createCallback(callback, thisArg, 3);
while (++index < length && callback(array[index], index, array)) {
n++;
}
} else {
n = callback;
if (n == null || thisArg) {
return array ? array[0] : undefined;
}
return slice(array, 0, nativeMin(nativeMax(0, n), length));
}
return slice(array, 0, nativeMin(nativeMax(0, n), length));
}
/**
@@ -4485,11 +4483,8 @@
* // => [{ 'name': 'banana', 'type': 'fruit' }]
*/
function initial(array, callback, thisArg) {
if (!array) {
return [];
}
var n = 0,
length = array.length;
length = array ? array.length : 0;
if (typeof callback != 'number' && callback != null) {
var index = length;
@@ -4618,24 +4613,22 @@
* // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]
*/
function last(array, callback, thisArg) {
if (array) {
var n = 0,
length = array.length;
var n = 0,
length = array ? array.length : 0;
if (typeof callback != 'number' && callback != null) {
var index = length;
callback = lodash.createCallback(callback, thisArg, 3);
while (index-- && callback(array[index], index, array)) {
n++;
}
} else {
n = callback;
if (n == null || thisArg) {
return array[length - 1];
}
if (typeof callback != 'number' && callback != null) {
var index = length;
callback = lodash.createCallback(callback, thisArg, 3);
while (index-- && callback(array[index], index, array)) {
n++;
}
} else {
n = callback;
if (n == null || thisArg) {
return array ? array[length - 1] : undefined;
}
return slice(array, nativeMax(0, length - n));
}
return slice(array, nativeMax(0, length - n));
}
/**