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Only use built-in Object.assign when in strict mode.

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jdalton
2015-04-22 20:23:30 -07:00
parent 641cd63462
commit fcc0608cf2
1 changed files with 13 additions and 6 deletions
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19
lodash.src.js
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@@ -803,12 +803,19 @@
//
// Use `Object.preventExtensions` on a plain object instead of simply using
// `Object('x')` because Chrome and IE fail to throw an error when attempting
// to assign values to readonly indexes of strings in strict mode.
var object = { '1': 0 },
func = preventExtensions && isNative(func = Object.assign) && func;
try { func(preventExtensions(object), 'xo'); } catch(e) {}
return !object[1] && func;
// to assign values to readonly indexes of strings.
var func = preventExtensions && isNative(func = Object.assign) && func;
try {
if (func) {
var object = preventExtensions({ '1': 0 });
object[0] = 1;
}
} catch(e) {
// Only attempt in strict mode.
try { func(object, 'xo'); } catch(e) {}
return !object[1] && func;
}
return false;
}());
/* Native method references for those with the same name as other `lodash` methods. */