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simplify comparisons with undefined & null (#2862)

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fixes #2857
This commit is contained in:
Alex Lam S.L
2018-02-01 16:50:54 +08:00
committed by GitHub
parent aa664dea0a
commit fad6766a90
2 changed files with 158 additions and 0 deletions
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130
test/compress/comparing.js
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@@ -112,3 +112,133 @@ self_comparison_2: {
}
expect_stdout: "false true"
}
issue_2857_1: {
options = {
comparisons: true,
}
input: {
a === undefined || a === null;
a === undefined || a !== null;
a !== undefined || a === null;
a !== undefined || a !== null;
a === undefined && a === null;
a === undefined && a !== null;
a !== undefined && a === null;
a !== undefined && a !== null;
}
expect: {
null == a;
void 0 === a || null !== a;
void 0 !== a || null === a;
void 0 !== a || null !== a;
void 0 === a && null === a;
void 0 === a && null !== a;
void 0 !== a && null === a;
null != a;
}
}
issue_2857_2: {
options = {
comparisons: true,
}
input: {
a === undefined || a === null || p;
a === undefined || a !== null || p;
a !== undefined || a === null || p;
a !== undefined || a !== null || p;
a === undefined && a === null || p;
a === undefined && a !== null || p;
a !== undefined && a === null || p;
a !== undefined && a !== null || p;
}
expect: {
null == a || p;
void 0 === a || null !== a || p;
void 0 !== a || null === a || p;
void 0 !== a || null !== a || p;
void 0 === a && null === a || p;
void 0 === a && null !== a || p;
void 0 !== a && null === a || p;
null != a || p;
}
}
issue_2857_3: {
options = {
comparisons: true,
}
input: {
a === undefined || a === null && p;
a === undefined || a !== null && p;
a !== undefined || a === null && p;
a !== undefined || a !== null && p;
a === undefined && a === null && p;
a === undefined && a !== null && p;
a !== undefined && a === null && p;
a !== undefined && a !== null && p;
}
expect: {
void 0 === a || null === a && p;
void 0 === a || null !== a && p;
void 0 !== a || null === a && p;
void 0 !== a || null !== a && p;
void 0 === a && null === a && p;
void 0 === a && null !== a && p;
void 0 !== a && null === a && p;
null != a && p;
}
}
issue_2857_4: {
options = {
comparisons: true,
}
input: {
p || a === undefined || a === null;
p || a === undefined || a !== null;
p || a !== undefined || a === null;
p || a !== undefined || a !== null;
p || a === undefined && a === null;
p || a === undefined && a !== null;
p || a !== undefined && a === null;
p || a !== undefined && a !== null;
}
expect: {
p || null == a;
p || void 0 === a || null !== a;
p || void 0 !== a || null === a;
p || void 0 !== a || null !== a;
p || void 0 === a && null === a;
p || void 0 === a && null !== a;
p || void 0 !== a && null === a;
p || null != a;
}
}
issue_2857_5: {
options = {
comparisons: true,
}
input: {
p && a === undefined || a === null;
p && a === undefined || a !== null;
p && a !== undefined || a === null;
p && a !== undefined || a !== null;
p && a === undefined && a === null;
p && a === undefined && a !== null;
p && a !== undefined && a === null;
p && a !== undefined && a !== null;
}
expect: {
p && void 0 === a || null === a;
p && void 0 === a || null !== a;
p && void 0 !== a || null === a;
p && void 0 !== a || null !== a;
p && void 0 === a && null === a;
p && void 0 === a && null !== a;
p && void 0 !== a && null === a;
p && null != a;
}
}