test/mjsunit/keyed-storage-extend.js

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function F() { }

function GrowNamed(o) {
  o.a = 1;
  o.b = 2;
  o.c = 3;
  o.d = 4;
  o.e = 5;
  o.f = 6;
}

function GrowKeyed(o) {
  var names = ['a','b','c','d','e','f']; 
  var i = 0;
  o[names[i++]] = i;
  o[names[i++]] = i;
  o[names[i++]] = i;
  o[names[i++]] = i;
  o[names[i++]] = i;
  o[names[i++]] = i;
}

GrowNamed(new F());
GrowNamed(new F());
GrowNamed(new F());
GrowKeyed(new F());
GrowKeyed(new F());
GrowKeyed(new F());