Using .toUpperCase() in conjunction with .includes()

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I'm trying to search through an array using the .includes() method. I don't want an element that is indeed in the array to go undetected using the .includes() method due to case sensitivity. Therefore, I am attempting to use .toUpperCase() in conjunction with .includes()

I don't understand why my code is not working.

var euroTour = ["France", "the Netherlands", "the UK", "Spain",

var findCountry = euroTour.toUpperCase().includes('FRANCE');

I expect that using the code above, that true would be written to the document. However, nothing is written. When I remove the .toUpperCase() method altogether, as expected, false is written to the document since the subject of the search 'FRANCE' is not the same thing as 'France', an actual element of the array.

.toUpperCase() can only be used on strings and not on whole array which you we were doing. Use map and capitalise the strings in array and then check with


var euroTour = ["France", "the Netherlands", "the UK", "Spain",

var findCountry =>e.toUpperCase()).includes('FRANCE');

String.prototype.toUpperCase(), The toUpperCase() method returns the calling string value converted to uppercase (the value will be converted to a string if it isn't one). The toUpperCase() method returns the value of the string converted to uppercase. This method does not affect the value of the string itself since JavaScript strings are immutable. Examples Basic usage console.log('alphabet'.toUpperCase()); // 'ALPHABET' Conversion of non-string this values to strings

var euroTour = ["France", "the Netherlands", "the UK", "Spain", "Portugal"];

var findCountry = euroTour
  .map(country => country.toUpperCase())
 // A More General Solution
 function includesStrCaseInsensitive(arr, str){
  return arr
    .map(i => i.toUpperCase())

console.log(includesStrCaseInsensitive(euroTour, 'FRANCE'));

console.log(includesStrCaseInsensitive(euroTour, 'FrANCE'));

The Copyeditor's Handbook: A Guide for Book Publishing and , coordinate conjunctions (and, but, or, for, nor),7 prepositions, scientific terms Father Driving through Maine APA four-letter rule (uppercase prepositions of  The first variant converts all of the characters in this String to upper case using the rules of the given Locale. This is equivalent to calling toUpperCase(Locale.getDefault()). The second variant takes locale as an argument to be used while converting into upper case. Syntax. Here is the syntax of this method − public String toUpperCase

includes does not provide a case insensitive option. You can use some in conjunction with a case-insensitive regex to accomplish what you want:

var euroTour = ["France", "the Netherlands", "the UK", "Spain", "Portugal"]

console.log(euroTour.some(country => /^france$/i.test(country)))

Cognition, Furthermore, these representations did not include case information (Adams, 1979). Consequently, illusory conjunctions between the case of one word and the identity Of these errors, 69 percent of the time a word following the uppercase word Using the RSVP technique, Broadbent and his colleagues (​Gathercole and  locale: Please specify the Locale you want to use while converting the String_Object characters to Uppercase. For example, English, Turkish, Latin, etc. Java toUpperCase Method Example. The Java string toUpperCase method converts the characters within a string to uppercase. This program will help to understand the string toupperCase method.

You're using toUpperCase() on the array euroTour, which isn't valid - it's only possible with strings. First map the array to upper case:

euroTour = => e.toUpperCase());

Then you can use .includes() on that:



var euroTour = ["France", "the Netherlands", "the UK", "Spain",

euroTour = => e.toUpperCase());

var findCountry = euroTour.includes("FRANCE");

Database Systems: Design, Implementation, & Management, For example, Oracle will not yield a result that includes Jones if you use the wildcard That is, an uppercase character has a different ASCII code than a lowercase The logical operators may be used in conjunction with the special operators. The java string toUpperCase() method converts all characters of the string into a uppercase letter. There are two variant of toUpperCase() method. Signature: public String toUpperCase(Locale loc) and public String toUpperCase() Parameter: loc- locale value to be applied.It converts all the characters into lowercase using the rules of given Locale.

String is Special - Java Programming Tutorial, A Java String contains an immutable sequence of Unicode characters. For example, the method toUpperCase() constructs and returns a new String instead of modifying For complex string, use StringBuffer / StringBuilder with a Formatter . They are especially useful for queries that include conditionals and grouping, in order to reduce the number of groups in the search results. toLowerCase and toUpperCase are useful when you use the following equating conditions with Sumo operators: the equal to sign (=) and the not equal to sign (!=) sign. These conditions are case-sensitive in

JavaScript String toUpperCase() Method, The toUpperCase() method converts a string to uppercase letters. Note: The toUpperCase() method does not change the original string. Tip: Use the toLowerCase  The ToUpper method is often used to convert a string to uppercase so that it can be used in a case-insensitive comparison. A better method to perform case-insensitive comparison is to call a string comparison method that has a StringComparison parameter whose value you set to StringComparison.CurrentCultureIgnoreCase for a culture-sensitive, case-insensitive comparison.

The New Werner Twentieth Century Edition of the Encyclopaedia , Those marked in by long use have approved themselves to all who the body of should To ' make up ' life ' s remaining years always be used in conjunction . toupper() Prototype int toupper(int ch); The toupper() function converts ch to its uppercase version if it exists. If the uppercase version of a character does not exist, it remains unmodified.

  • Thanks. I'm a super beginner at JS and hadn't understood regex's when you commented this response. I took the time to l learn and your code was useful to testing my understanding of such.