Run results for: Multiplying lists of vectors - with or without declaration

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2906.0 Safari/537.36 OPR/43.0.2420.0 (Edition developer)

Browser: Opera 43

Operating system: Windows

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
with duplicate declaration	11.9 Ops/sec
without duplicate declaration	1.5 Ops/sec

Script Preparation code:

var N = 1000000;

var vectors = [];
var vector;
for (var i = 0, li=N; i < li; ++i) {
	vectors.push( {x:Math.random(), y:Math.random(), z:Math.random()} );
}
abc=123
var abc=456

Tests:

with duplicate declaration
var vector; for (var i = 0, li=vectors.length; i < li; ++i) { vector = vectors[i]; vector.x = 2 * vector.x; vector.y = 2 * vector.y; vector.z = 2 * vector.z; } abc=123 def=456 var abc
without duplicate declaration
for (var i = 0, li=vectors.length; i < li; ++i) { vector = vectors[i]; vector.x = 2 * vector.x; vector.y = 2 * vector.y; vector.z = 2 * vector.z; }

Run results for: Multiplying lists of vectors - with or without declaration

with duplicate declaration

without duplicate declaration