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clean up destructuring transformer and optimise array destructuring - closes #749

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Sebastian McKenzie
2015-02-19 19:16:27 +11:00
parent 5e4a008a06
commit 83cd3bef92
3 changed files with 164 additions and 59 deletions
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9
test/fixtures/transformation/es6-destructuring/array-unpack-optimisation/actual.js vendored Normal file
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// opt
var [a, b] = [1, 2];
var [[a, b]] = [[1, 2]];
// deopt
var [a, b] = [1, 2, 3];
var [[a, b]] = [[1, 2, 3]];
var [a, b, ...items] = [1, 2, 3];
var [[a, b, ...items]] = [[1, 2, 3]];

23
test/fixtures/transformation/es6-destructuring/array-unpack-optimisation/expected.js vendored Normal file
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"use strict";
// opt
var a = 1;
var b = 2;
var a = 1;
var b = 2;
// deopt
var _ref = [1, 2, 3];
var a = _ref[0];
var b = _ref[1];
var _ref2 = [1, 2, 3];
var a = _ref2[0];
var b = _ref2[1];
var _ref3 = [1, 2, 3];
var a = _ref3[0];
var b = _ref3[1];
var items = _ref3.slice(2);
var _ref4 = [1, 2, 3];
var a = _ref4[0];
var b = _ref4[1];
var items = _ref4.slice(2);