{"id":4817,"date":"2017-06-09T04:57:27","date_gmt":"2017-06-09T08:57:27","guid":{"rendered":"http:\/\/local.brightwhiz\/?p=4817"},"modified":"2021-12-08T12:02:13","modified_gmt":"2021-12-08T17:02:13","slug":"equality-operators-javascript","status":"publish","type":"post","link":"http:\/\/local.brightwhiz\/equality-operators-javascript\/","title":{"rendered":"A Tale of Two Equality Operators (== vs ===) in JavaScript and PHP"},"content":{"rendered":"\n<p>Before you run off and write to the <a href=\"\/\/local.brightwhiz\/tag\/javascript\/\">JavaScript<\/a> and <a href=\"\/\/local.brightwhiz\/tag\/php\/\">PHP<\/a> maintainers to complain about a type or syntax error or duplication or whatever it is good to note that there is no mistake with the equality operators in these languages.<\/p>\n\n\n\n<p>As a matter of fact the <code>==<\/code> vs <code>===<\/code> operators have their place and even go by different names. The Equality operator (<code>==<\/code>) is definitely different from the identity operator (<code>===<\/code>). Now if they both behave the same, why do we need two operators to do the same thing? I guess that is why you are here to find out, and we won&#8217;t disappoint you.<\/p>\n\n\n\n<p>The two equality <a href=\"\/\/local.brightwhiz\/tag\/operators\/\">operators<\/a> basically do the same thing but it is the way they do them that differs. The identity operator will not bother to do extra work just to force a positive or true comparison. It is therefore quite <em>&#8220;lazy&#8221;<\/em> in that aspect compared to the equality operator. The latter will do some necessary conversions before comparing whatever it needs to.<\/p>\n\n\n\n<p>This brings in a little overhead and therefore from a performance standpoint, the identity operator is faster. It is also a safer operator and it compares apples to apples and does not try to force a peach to be an apple.<\/p>\n\n\n\n<p>With the equality operator <strong>10<\/strong> and <strong>&#8217;10&#8217;<\/strong> and equal because they can be cast into each other successfully. In the strict sense as far as the identity operator goes <strong>10<\/strong> is not equal to <strong>&#8217;10&#8217;<\/strong>. In human speak, the first one is a number while the second is a word. This makes them have different data types and that is exactly what the identity operator factors in.<\/p>\n\n\n\n<p>Where appropriate the <code>===<\/code> operator will also do the necessary checks before comparing. For instance, <code>var a = &#039;Hou&#039;+&#039;se&#039;;<\/code> would be true and be equal to <code>var b = &#039;House&#039;;<\/code>. In the former, the strings will be concatenated before the comparison is made. What is important to note is that in both cases a and b would match in value and datatype.<\/p>\n\n\n\n<p>The sister operators <code>!=<\/code> and <code>!==<\/code> follow the same basic rules but in this case, they look for not equal rather than equals. The <code>!=<\/code> will perform all the necessary type conversions before comparing while the <code>!==<\/code> operator will just compare the values and the data types.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Before you run off and write to the JavaScript and PHP maintainers to complain about a type or syntax error or duplication or whatever it is good to note that&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4818,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,27,16],"tags":[328,432,452,471],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comparing the two Equality Operators (== vs ===) in JavaScript and PHP<\/title>\n<meta name=\"description\" content=\"PHP and JavaScript come with two equality operators (== vs ===) and their related operators (!= vs !==) that compare values and\/or datatypes\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/local.brightwhiz\/equality-operators-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comparing the two Equality Operators (== vs ===) in JavaScript and PHP\" \/>\n<meta property=\"og:description\" content=\"PHP and JavaScript come with two equality operators (== vs ===) and their related operators (!= vs !==) that compare values and\/or datatypes\" \/>\n<meta property=\"og:url\" content=\"http:\/\/local.brightwhiz\/equality-operators-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"Brightwhiz.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/brightwhiz\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-06-09T08:57:27+00:00\" 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