src/v8/test/mjsunit/compiler/unary-add.js

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// Test unary addition in various contexts.

// Test value context.
assertEquals(1, +'1');
assertEquals(1, +1);
assertEquals(1.12, +1.12);
assertEquals(NaN, +undefined);
assertEquals(NaN, +{});

// Test effect context.
assertEquals(1, eval("+'1'; 1"));
assertEquals(1, eval("+1; 1"));
assertEquals(1, eval("+1.12; 1"));
assertEquals(1, eval("+undefined; 1"));
assertEquals(1, eval("+{}; 1"));

// Test test context.
assertEquals(1, (+'1') ? 1 : 2);
assertEquals(1, (+1) ? 1 : 2);
assertEquals(1, (+'0') ? 2 : 1);
assertEquals(1, (+0) ? 2 : 1);
assertEquals(1, (+1.12) ? 1 : 2);
assertEquals(1, (+undefined) ? 2 : 1);
assertEquals(1, (+{}) ? 2 : 1);

// Test value/test context.
assertEquals(1, +'1' || 2);
assertEquals(1, +1 || 2);
assertEquals(1.12, +1.12 || 2);
assertEquals(2, +undefined || 2);
assertEquals(2, +{} || 2);

// Test test/value context.
assertEquals(2, +'1' && 2);
assertEquals(2, +1 && 2);
assertEquals(0, +'0' && 2);
assertEquals(0, +0 && 2);
assertEquals(2, +1.12 && 2);
assertEquals(NaN, +undefined && 2);
assertEquals(NaN, +{} && 2);