Use the F12 key in Chrome and other chromium-based browsers.Note: We will use the browser console to demonstrate examples performed in this post. Since this article is about JavaScript, we will only use includes() in our article from here on. The includes() and contains() both have the same functionality, but in JavaScript, this functionality is termed as includes(), while in other programming languages such as Java, it is called contains(). It is used in other languages such as Java. The includes() is a method present in JavaScript, whereas contains() is not present in JavaScript. The includes and contains both methods search for a substring within a string or find elements within an array. It is 0 by default.ĭifference between includes() and contains() It gives the index at which to start the search. starting_point: This parameter is optional.It is the element that needs to be searched within the array. element: The first parameter is required.The include() method takes two parameters in JavaScript:
includes("Rob") will return false.Array_name. the include function is case-sensitive.For example myArray.includes("Rob", 2) will return true if the "Rob" value is found only after the index 2 of the array. it takes a second optional argument, as the index from there to start the search.Some final notes on the include() function: result2 = false Notes on the Javascript include() function Let result2 = s2.every(i => myArray.includes(i)) Let result1 = s1.every(i => myArray.includes(i)) On the other side, if we want to check if ALL values are present in a Javascript array, we will use includes() combined with the every() method: const myArray = result2 = false Check for all values to be included in an array Let result2 = s2.some(i => myArray.includes(i)) Let result1 = s1.some(i => myArray.includes(i)) We can do this by mixing the includes() function and the some() function: const myArray = Let's say we want to test if AT LEAST ONE value, from a given set, is present in a Javascript array. Check for at least one value to be included in an array Unfortunately the includes() function does not have a multiple values search option, but we can simulate this with the help of others Javascript array functions. The Javascript array includes() function will return true if a value is found in an array or false otherwise.īut is it possible to add multiple conditions to this function? Something like this: myArray.includes("one", "two", "three")
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