{"id":256981,"date":"2024-04-03T06:50:39","date_gmt":"2024-04-03T06:50:39","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=256981"},"modified":"2024-04-03T06:50:39","modified_gmt":"2024-04-03T06:50:39","slug":"how-to-check-nan-value-in-javascript","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/","title":{"rendered":"How to check NaN value in JavaScript?"},"content":{"rendered":"<p>JavaScript provides a built-in function called isNaN() that allows us to check whether a value is NaN (Not-a-Number) or not. NaN represents an undefined or unrepresentable value resulting from an operation that could not produce a normal result. Let&#8217;s explore how to use the isNaN() function and some related FAQs.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#How_to_Check_NaN_Value_in_JavaScript\" title=\"How to Check NaN Value in JavaScript?\">How to Check NaN Value in JavaScript?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#FAQs\" title=\"FAQs:\">FAQs:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#1_What_is_NaN_in_JavaScript\" title=\"1. What is NaN in JavaScript?\">1. What is NaN in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#2_Why_is_NaN_useful_in_JavaScript\" title=\"2. Why is NaN useful in JavaScript?\">2. Why is NaN useful in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#3_What_is_the_return_type_of_isNaN\" title=\"3. What is the return type of isNaN()?\">3. What is the return type of isNaN()?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#4_How_does_isNaN_determine_if_a_value_is_NaN\" title=\"4. How does isNaN() determine if a value is NaN?\">4. How does isNaN() determine if a value is NaN?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#5_Is_NaN_equal_to_anything_in_JavaScript\" title=\"5. Is NaN equal to anything in JavaScript?\">5. Is NaN equal to anything in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#6_Can_isNaN_be_used_to_check_if_a_non-numeric_string_is_NaN\" title=\"6. Can isNaN() be used to check if a non-numeric string is NaN?\">6. Can isNaN() be used to check if a non-numeric string is NaN?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#7_Can_isNaN_be_used_to_check_if_a_value_is_undefined\" title=\"7. Can isNaN() be used to check if a value is undefined?\">7. Can isNaN() be used to check if a value is undefined?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#8_Can_isNaN_be_used_to_check_if_a_value_is_null\" title=\"8. Can isNaN() be used to check if a value is null?\">8. Can isNaN() be used to check if a value is null?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#9_How_does_isNaN_handle_different_data_types\" title=\"9. How does isNaN() handle different data types?\">9. How does isNaN() handle different data types?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#10_Are_both_an_empty_string_and_whitespace_considered_NaN\" title=\"10. Are both an empty string and whitespace considered NaN?\">10. Are both an empty string and whitespace considered NaN?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#11_Can_I_use_the_isNaN_function_with_arrays\" title=\"11. Can I use the isNaN() function with arrays?\">11. Can I use the isNaN() function with arrays?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#12_Can_I_rely_on_the_isNaN_function_to_check_if_a_value_is_numeric\" title=\"12. Can I rely on the isNaN() function to check if a value is numeric?\">12. Can I rely on the isNaN() function to check if a value is numeric?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Check_NaN_Value_in_JavaScript\"><\/span>How to Check NaN Value in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\nTo check if a value is NaN in JavaScript, you can use the isNaN() function. This function takes a single argument and returns true if the argument is NaN; otherwise, it returns false.<\/p>\n<p>Here&#8217;s an example that demonstrates how to use isNaN():<\/p>\n<p>&#8220;`javascript<br \/>\nconst result = isNaN(10);<br \/>\nconsole.log(result); \/\/ Output: false<\/p>\n<p>const result2 = isNaN(&#8216;Hello&#8217;);<br \/>\nconsole.log(result2); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<p>In the above example, we use the isNaN() function to check if the values 10 and &#8216;Hello&#8217; are NaN. The isNaN() function returns false for the number 10 as it is a valid number, but it returns true for the string &#8216;Hello&#8217; since it cannot be converted to a number.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_What_is_NaN_in_JavaScript\"><\/span>1. What is NaN in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNaN stands for Not-a-Number and is a special value in JavaScript that represents an undefined or unrepresentable value resulting from an invalid mathematical operation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Why_is_NaN_useful_in_JavaScript\"><\/span>2. Why is NaN useful in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNaN is useful in JavaScript to indicate when a value is not a valid number. It allows you to identify and handle exceptional or unexpected mathematical operations gracefully.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_What_is_the_return_type_of_isNaN\"><\/span>3. What is the return type of isNaN()?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe isNaN() function returns a boolean value. It returns true if the argument supplied is NaN and false otherwise.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_does_isNaN_determine_if_a_value_is_NaN\"><\/span>4. How does isNaN() determine if a value is NaN?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe isNaN() function attempts to convert the argument it receives to a number. If the conversion is successful and the resulting value is NaN, the function returns true. Otherwise, it returns false.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Is_NaN_equal_to_anything_in_JavaScript\"><\/span>5. Is NaN equal to anything in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, NaN is not equal to anything in JavaScript, not even to itself. It has a unique property that any comparison, even with itself, always returns false.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Can_isNaN_be_used_to_check_if_a_non-numeric_string_is_NaN\"><\/span>6. Can isNaN() be used to check if a non-numeric string is NaN?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use the isNaN() function to check if a non-numeric string is NaN. The function will return true if the string cannot be converted to a number.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Can_isNaN_be_used_to_check_if_a_value_is_undefined\"><\/span>7. Can isNaN() be used to check if a value is undefined?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, the isNaN() function is specifically designed to check for NaN values and not for undefined values. To check if a value is undefined, you should use the typeof operator or a strict equality operator.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_isNaN_be_used_to_check_if_a_value_is_null\"><\/span>8. Can isNaN() be used to check if a value is null?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, the isNaN() function is not suitable for checking if a value is null. To test for null, you can simply compare the value with null using the strict equality operator (===).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_How_does_isNaN_handle_different_data_types\"><\/span>9. How does isNaN() handle different data types?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe isNaN() function tries to convert its argument to a number before determining if it is NaN or not. It will return false for any argument that can be successfully converted to a number, regardless of its original data type.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Are_both_an_empty_string_and_whitespace_considered_NaN\"><\/span>10. Are both an empty string and whitespace considered NaN?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, empty strings and whitespace are not considered NaN. An empty string can be converted to the number 0, while whitespace will be trimmed before conversion, resulting in 0 as well.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Can_I_use_the_isNaN_function_with_arrays\"><\/span>11. Can I use the isNaN() function with arrays?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhen passed an array, the isNaN() function tries to convert the whole array to a single number value. This may produce unexpected results. Instead, you should loop through the array and check each element individually using isNaN().<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Can_I_rely_on_the_isNaN_function_to_check_if_a_value_is_numeric\"><\/span>12. Can I rely on the isNaN() function to check if a value is numeric?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhile isNaN() can help determine if a value is not a number, it is not a reliable method for checking if a value is numeric. Instead, consider using other techniques like regular expressions or type checking to ensure a value is numeric.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript provides a built-in function called isNaN() that allows us to check whether a value is NaN (Not-a-Number) or not. NaN represents an undefined or unrepresentable value resulting from an operation that could not produce a normal result. Let&#8217;s explore how to use the isNaN() function and some related FAQs. How to Check NaN Value &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to check NaN value in JavaScript?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-nan-value-in-javascript\/#more-256981\">Read more<span class=\"screen-reader-text\">How to check NaN value in JavaScript?<\/span><\/a><\/p>\n","protected":false},"author":65,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-256981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to check NaN value in JavaScript?<\/title>\n<meta name=\"description\" content=\"JavaScript provides a built-in function called isNaN() that allows us to check whether a value is NaN (Not-a-Number) or not. 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