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don't unpack array when the pattern contains more elements than the corresponding array expression

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This commit is contained in:
Sebastian McKenzie 2015-02-22 22:35:38 +11:00
parent c3c94f0a4a
commit 0b2f1fedcb
1 changed files with 3 additions and 2 deletions
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5
lib/babel/transformation/transformers/es6/destructuring.js
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@ -168,6 +168,7 @@ DestructuringTransformer.prototype.canUnpackArrayPattern = function (pattern, ar
// pattern has less elements than the array and doesn't have a rest so some // pattern has less elements than the array and doesn't have a rest so some
// elements wont be evaluated // elements wont be evaluated
if (pattern.elements.length > arr.elements.length) return;
if (pattern.elements.length < arr.elements.length && !hasRest(pattern)) return false; if (pattern.elements.length < arr.elements.length && !hasRest(pattern)) return false;
// deopt on holes // deopt on holes
@ -418,7 +419,7 @@ exports.AssignmentExpression = function (node, parent, scope, file) {
return t.toSequenceExpression(nodes, scope); return t.toSequenceExpression(nodes, scope);
}; };
var variableDeclarationhasPattern = function (node) { var variableDeclarationHasPattern = function (node) {
for (var i = 0; i < node.declarations.length; i++) { for (var i = 0; i < node.declarations.length; i++) {
if (t.isPattern(node.declarations[i].id)) { if (t.isPattern(node.declarations[i].id)) {
return true; return true;
@ -429,7 +430,7 @@ var variableDeclarationhasPattern = function (node) {
exports.VariableDeclaration = function (node, parent, scope, file) { exports.VariableDeclaration = function (node, parent, scope, file) {
if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return; if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return;
if (!variableDeclarationhasPattern(node)) return; if (!variableDeclarationHasPattern(node)) return;
var nodes = []; var nodes = [];
var declar; var declar;