tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Map-set-undefined.js (362B)

      1 // Setting a Map key to undefined, or a missing argument, isn't the same as deleting it.
      2 
      3 var m = new Map;
      4 m.set(42, undefined);
      5 assertEq(m.has(42), true);
      6 assertEq(m.get(42), undefined);
      7 
      8 m.set(42, "wrong");
      9 m.set(42);
     10 assertEq(m.has(42), true);
     11 assertEq(m.get(42), undefined);
     12 
     13 m.set();
     14 assertEq(m.has(undefined), true);
     15 assertEq(m.get(undefined), undefined);