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fixes & improvements to [].join()

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fixes
- [a].join() => "" + a
- ["a", , "b"].join() => "a,,b"
- ["a", null, "b"].join() => "a,,b"
- ["a", undefined, "b"].join() => "a,,b"

improvements
- ["a", "b"].join(null) => "anullb"
- ["a", "b"].join(undefined) => "a,b"
- [a + "b", c].join("") => a + "b" + c

closes #1453
This commit is contained in:
alexlamsl
2017-02-18 19:05:11 +08:00
parent 148047fbbf
commit 100307ab31
2 changed files with 92 additions and 23 deletions
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53
test/compress/arrays.js
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@@ -21,10 +21,19 @@ constant_join: {
input: {
var a = [ "foo", "bar", "baz" ].join("");
var a1 = [ "foo", "bar", "baz" ].join();
var a2 = [ "foo", "bar", "baz" ].join(null);
var a3 = [ "foo", "bar", "baz" ].join(void 0);
var a4 = [ "foo", , "baz" ].join();
var a5 = [ "foo", null, "baz" ].join();
var a6 = [ "foo", void 0, "baz" ].join();
var b = [ "foo", 1, 2, 3, "bar" ].join("");
var c = [ boo(), "foo", 1, 2, 3, "bar", bar() ].join("");
var c1 = [ boo(), bar(), "foo", 1, 2, 3, "bar", bar() ].join("");
var c2 = [ 1, 2, "foo", "bar", baz() ].join("");
var c3 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join("");
var c4 = [ 1, 2, null, undefined, "foo", "bar", baz() ].join("");
var c5 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join();
var c6 = [ 1, 2, null, undefined, "foo", "bar", baz() ].join();
var d = [ "foo", 1 + 2 + "bar", "baz" ].join("-");
var e = [].join(foo + bar);
var f = [].join("");
@@ -33,10 +42,19 @@ constant_join: {
expect: {
var a = "foobarbaz";
var a1 = "foo,bar,baz";
var a2 = "foonullbarnullbaz";
var a3 = "foo,bar,baz";
var a4 = "foo,,baz";
var a5 = "foo,,baz";
var a6 = "foo,,baz";
var b = "foo123bar";
var c = boo() + "foo123bar" + bar();
var c1 = "" + boo() + bar() + "foo123bar" + bar();
var c2 = "12foobar" + baz();
var c3 = boo() + bar() + "foo123bar" + (bar() + "foo");
var c4 = "12foobar" + baz();
var c5 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join();
var c6 = [ "1,2,,,foo,bar", baz() ].join();
var d = "foo-3bar-baz";
var e = [].join(foo + bar);
var f = "";
@@ -73,6 +91,41 @@ constant_join_2: {
}
}
constant_join_3: {
options = {
unsafe: true,
evaluate: true,
};
input: {
var a = [ null ].join();
var b = [ , ].join();
var c = [ , 1, , 3 ].join();
var d = [ foo ].join();
var e = [ foo, null, undefined, bar ].join("-");
var f = [ foo, bar ].join("");
var g = [ null, "foo", null, bar + "baz" ].join("");
var h = [ null, "foo", null, bar + "baz" ].join("-");
var i = [ "foo" + bar, null, baz + "moo" ].join("");
var j = [ foo + "bar", baz ].join("");
var k = [ foo, "bar" + baz ].join("");
var l = [ foo, bar + "baz" ].join("");
}
expect: {
var a = "";
var b = "";
var c = ",1,,3";
var d = "" + foo;
var e = [ foo, "-", bar ].join("-");
var f = "" + foo + bar;
var g = "foo" + (bar + "baz");
var h = [ "-foo-", bar + "baz" ].join("-");
var i = "foo" + bar + (baz + "moo");
var j = foo + "bar" + baz;
var k = foo + ("bar" + baz);
var l = foo + (bar + "baz");
}
}
for_loop: {
options = {
unsafe : true,