Search results
8 lut 2024 · Learn how to use the includes() method to check if an array contains a certain value. See syntax, parameters, return value, description, examples, and browser compatibility.
The includes() method returns true if an array contains a specified value. The includes() method returns false if the value is not found. The includes() method is case sensitive.
What is the most concise and efficient way to find out if a JavaScript array contains a value? This is the only way I know to do it: function contains(a, obj) { for (var i = 0; i < a.length; i++) { if (a[i] === obj) { return true; } } return false; }
Learn how to use array methods such as includes(), some(), and map() to check if an array contains a primitive value, a string, a number, or an object. See examples, explanations, and code snippets for each case.
28 cze 2022 · Learn how to use the includes() method in JavaScript to check if an item is in an array or a substring is in a string. See syntax, examples and explanations with code snippets.
21 lip 2020 · The easiest way to determine if an array contains a primitive value is to use array.includes() ES2015 array method: const hasValue = array.includes(value[, fromIndex]); The first argument value is the value to search in the array.
8 lip 2019 · There are two common ways to check if a JavaScript array contains a value: `includes()` and `indexOf()`. This tutorial shows you how to use both, and why you would use one versus the other.
