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Explanations for each step of isPlainObject

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Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
This commit is contained in:
Rick Waldron 2012-12-24 10:54:11 -05:00
parent 7e3f96cf3f
commit 3746bf8feb
1 changed files with 8 additions and 1 deletions
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9
src/core.js
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@ -412,12 +412,17 @@ jQuery.extend({
}, },
isPlainObject: function( obj ) { isPlainObject: function( obj ) {
// Not plain objects: params that are not [[Class]] "[object Object]", DOM nodes, window // Not plain objects:
// - Any object or value whose internal [[Class]] property is not "[object Object]"
// - DOM nodes
// - window
if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) { if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
return false; return false;
} }
// Support: Firefox >16 // Support: Firefox >16
// The try/catch supresses exceptions thrown when attempting to access
// the "constructor" property of certain host objects, ie. |window.location|
try { try {
if ( obj.constructor && if ( obj.constructor &&
!core_hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) { !core_hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
@ -427,6 +432,8 @@ jQuery.extend({
return false; return false;
} }
// If the function hasn't returned already, we're confident that
// |obj| is a plain object, created by {} or constructed with new Object
return true; return true;
}, },