How does the single equal sign work in the if statement in javascript

by

The first part of your analysis is of course correct.

Now, the interesting part might be why your last code if (var ...) { doesn’t work.

It doesn’t work because

1) 

var something

is a statement, not an expression.

2) here’s how ECMAScript defines the if statement :

IfStatement :

if ( Expression ) Statement else Statement

if ( Expression ) Statement

You must put an expression in the if clause, not a statement.

More on expressions vs statement in this article.

More Related Contents:

  1. How to wait until promise finishes before continuing the loop
  2. How to extract the hyper links from a webpage in javascript
  3. How to input php as url in javascript
  4. Show image in div and add PREV/NEXT buttons
  5. Negative lookbehind equivalent in JavaScript
  6. How to get the response of XMLHttpRequest?
  7. How do I share $scope data between states in angularjs ui-router?
  8. How can I call PHP functions by JavaScript?
  9. Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
  10. Execute JavaScript using Selenium WebDriver in C#
  11. How to force Angular2 to POST using x-www-form-urlencoded
  12. Prevent form redirect OR refresh on submit?
  13. jquery’s live() is deprecated. What do I use now?
  14. Reading cookie expiration date
  15. How to send push notification to web browser?
  16. Detect all Firefox versions in JS
  17. ReactJS: “Uncaught SyntaxError: Unexpected token
  18. How to round an integer up or down to the nearest 10 using Javascript
  19. Does node.js have equivalent to window object in browser
  20. Easiest way to convert month name to month number in JS ? (Jan = 01)
  21. $(window).scrollTop() vs. $(document).scrollTop()
  22. Does HTML Hidden control have any events? Like onchange or something?
  23. Is there a way to return early in deferred promise?
  24. How to trigger jquery.ajax() error callback based on server response, not HTTP 500?
  25. Javascript 0 in beginning of number
  26. How to get the first element of Set in ES6 ( EcmaScript 2015)
  27. Defer loading and parsing of PrimeFaces JavaScript files
  28. Polymer 1.0 Global Variables
  29. How to access css properties in javascript when applied via external CSS file?
  30. How to loop all the elements that match the regex?

Leave a Comment