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Ensure _.concat cases wraps nullish array values in an array.

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This commit is contained in:
John-David Dalton
2016-03-28 17:44:13 -07:00
parent a7bf3352df
commit 3fe2efa311
2 changed files with 23 additions and 37 deletions
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18
lodash.js
View File

@@ -5853,13 +5853,19 @@
* console.log(array);
* // => [1]
*/
var concat = rest(function(array, values) {
if (!isArray(array)) {
array = array == null ? [] : [array];
function concat() {
var length = arguments.length;
if (!length) {
return [];
}
values = baseFlatten(values, 1);
return arrayConcat(array, values);
});
var array = castArray(arguments[0]),
args = Array(length - 1);
while (length--) {
args[length - 1] = arguments[length];
}
return arrayConcat(array, baseFlatten(args, 1));
}
/**
* Creates an array of unique `array` values not included in the other given

42
test/test.js
View File

@@ -3066,46 +3066,26 @@
assert.deepEqual(array, [1]);
});
QUnit.test('should return an empty array when `array` is nullish', function(assert) {
assert.expect(1);
QUnit.test('should cast non-array `array` values to arrays', function(assert) {
assert.expect(2);
var values = [, null, undefined],
expected = lodashStable.map(values, alwaysEmptyArray);
var values = [, null, undefined, false, true, 1, NaN, 'a'];
var expected = lodashStable.map(values, function(value, index) {
return index ? [value] : [];
});
var actual = lodashStable.map(values, function(value, index) {
try {
return index ? _.concat(value) : _.concat();
} catch (e) {}
return index ? _.concat(value) : _.concat();
});
assert.deepEqual(actual, expected);
});
QUnit.test('should treat nullish `array` values as empty arrays', function(assert) {
assert.expect(1);
var values = [null, undefined],
expected = lodashStable.map(values, lodashStable.constant([1, 2, [3]]));
var actual = lodashStable.map(values, function(value) {
try {
return _.concat(value, 1, [2], [[3]]);
} catch (e) {}
expected = lodashStable.map(values, function(value) {
return [value, 2, [3]];
});
assert.deepEqual(actual, expected);
});
QUnit.test('should cast non-array `array` values to arrays', function(assert) {
assert.expect(1);
var values = [true, false, 1, NaN, 'a'];
var expected = lodashStable.map(values, function(value) {
return [value, 2, [3]]
});
var actual = lodashStable.map(values, function(value) {
actual = lodashStable.map(values, function(value) {
return _.concat(value, [2], [[3]]);
});