Conditional variable assignment

Benchmark created by Mathias Bynens on

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Testing in
TestOps/sec
x = x || y; when x is falsy
var foo; // foo === undefined
foo = foo || 'default';
// foo === 'default';
ready
x || (x = y); when x is falsy
var foo; // foo === undefined
foo || (foo = 'default');
// foo === 'default';
ready
!x && (x = y); when x is falsy
var foo; // foo === undefined
!foo && (foo = 'default');
// foo === 'default';
ready
x = x || y; when x is truthy
var foo = 'value';
foo = foo || 'default';
// foo === 'value';
ready
x || (x = y); when x is truthy
var foo = 'value';
foo || (foo = 'default');
// foo === 'value';
ready
!x && (x = y); when x is truthy
var foo = 'value';
!foo && (foo = 'default');
// foo === 'value';
ready

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