The Javascript array includes() function will return true
if a value is found in an array or false
otherwise.
But is it possible to add multiple conditions to this function? Something like this:
myArray.includes("š apple", "š pear", "š½ corn")
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.
Check for at least one value to be included in an array
Let's say we want to test if AT LEAST ONE value, from a given set, is present in a Javascript array.
We can do this by mixing the includes()
function and the some() function:
//1. checking if AT LEAST ONE value is in the array
const products = ['š apple', 'š„¬ kale', 'š pear', 'š½ corn']
const fruits = ['š pear', 'š apple']
const veggies = ['š„¬ kale', 'š§
onion']
const atLeastOneFruit = fruits.some(i => products.includes(i))
// true
const atLeastOneVeggie = veggies.some(i => products.includes(i))
// true
Check for all values to be included in an array
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:
//2. checking if ALL THE values are in the array
const products = ['š apple', 'š„¬ kale', 'š pear', 'š½ corn']
const fruits = ['š pear', 'š apple']
const veggies = ['š„¬ kale', 'š§
onion']
const allTheFruits = fruits.every(i => products.includes(i))
// true
const allTheVeggies = veggies.every(i => products.includes(i))
// false, the 'š§
onion' is missing
You can checkout the full code of this example on my Gitub and the running app here.
Notes on the Javascript include() function
Some extra notes on this function:
- the include function is case-sensitive. For example
["rob", "joe"].includes("ROB")
will returnfalse
; - also, include() takes a second optional argument. This argument is the index from where to start the search from. For example
myArray.includes("Rob", 2)
will returntrue
if the"Rob"
value is found only after the index 2 of the array. The index is zero based.
š 50 Javascript, React and NextJs Projects
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š 50 Javascript, React and NextJs Projects
Learn by doing with this FREE ebook! Not sure what to build? Dive in with 50 projects with project briefs and wireframes! Choose from 8 project categories and get started right away.