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Ensure _.add and _.subtract return 0 when no arguments are given.

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This commit is contained in:
John-David Dalton
2016-02-07 22:43:13 -08:00
parent d790a1b3c6
commit 18ae1d7c18
2 changed files with 18 additions and 0 deletions
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6
lodash.js
View File

@@ -13862,6 +13862,9 @@
*/ */
function add(augend, addend) { function add(augend, addend) {
var result; var result;
if (augend === undefined && addend === undefined) {
return 0;
}
if (augend !== undefined) { if (augend !== undefined) {
result = augend; result = augend;
} }
@@ -14072,6 +14075,9 @@
*/ */
function subtract(minuend, subtrahend) { function subtract(minuend, subtrahend) {
var result; var result;
if (minuend === undefined && subtrahend === undefined) {
return 0;
}
if (minuend !== undefined) { if (minuend !== undefined) {
result = minuend; result = minuend;
} }

12
test/test.js
View File

@@ -997,6 +997,12 @@
assert.strictEqual(_.add(-6, -4), -10); assert.strictEqual(_.add(-6, -4), -10);
}); });
QUnit.test('should return `0` when no arguments are given', function(assert) {
assert.expect(1);
assert.strictEqual(_.add(), 0);
});
QUnit.test('should not coerce arguments to numbers', function(assert) { QUnit.test('should not coerce arguments to numbers', function(assert) {
assert.expect(2); assert.expect(2);
@@ -19196,6 +19202,12 @@
assert.strictEqual(_.subtract(-6, -4), -2); assert.strictEqual(_.subtract(-6, -4), -2);
}); });
QUnit.test('should return `0` when no arguments are given', function(assert) {
assert.expect(1);
assert.strictEqual(_.subtract(), 0);
});
QUnit.test('should coerce arguments only numbers', function(assert) { QUnit.test('should coerce arguments only numbers', function(assert) {
assert.expect(2); assert.expect(2);