JavaScript syntax: Difference between revisions

Revision as of 15:32, 6 July 2018

Revision as of 14:00, 4 September 2018

Line 172:

<syntaxhighlight lang="javascript">

var test; // variable declared, but not defined, ...

// ... set to value of undefined

var testObj = {};

console.log(test); // test variable exists, but value not ...

// ... defined, displays undefined

console.log(testObj.myProp); // testObj exists, property does not, ...

// ... displays undefined

console.log(undefined == null); // unenforced type during check, displays true

console.log(undefined === null); // enforce type during check, displays false

</syntaxhighlight>