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gczeal(2); function A(a) { this.a = a; } function B(b) { this.b = b; } function C(c) { this.c = c; } function makeArray(n) { var classes = [A, B, C]; var arr = []; for (var i = 0; i < n; i++) { arr.push(new classes[i % 3](i % 3)); } } var arr = makeArray(30000);