Benchmark: Add empty string

Script Preparation code:

var strings = { a: 'foo', b: 'bar' }
var obj = { a: true, b: true, c: true, d: true, e: true }
var str = ''

Tests:

add empty
for (var key in obj) str += strings[key] || ''
don't add
for (var key in obj) { if (strings[key]) str += strings[key] }
Don't add, save access
for (var key in obj) { var val = strings[key] if (val) str += val }

Rendered benchmark preparation results:

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Add empty string (version: 0)