Create, initialize and modify OR all in the same time ?

JavaScript performance comparison

Test case created by PifyZ

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Testing in unknown unknown
Test Ops/sec
Create, initialize and modify
var mov;

mov = { x: 0, y: 0 };

mov.x = 2 + 2;
mov.y = mov.x + 2;
All in the same time
var movX = 2 + 2;
var movY = movX + 2;

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