Question

How to check whether a value exists in an array with Array.some() in JavaScript

Answer 1

function checkExist(arr, val) {
    return arr.some(function(arr_value) {
        return val === arr_value;
    });
}
  
const arr = ['PHP', 'C#', 'Java', 'C++', 'JavaScript'];

if (checkExist(arr, 'JavaScript')) {
    console.log("yes");
}
else {
    console.log("no"); 
}
 
 
    
/*
run:  
   
yes 
    
*/

 

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Answer 2

function checkExist(arr, val) {
    return arr.some(arr_value => val === arr_value);
}
  
const arr = ['PHP', 'C#', 'Java', 'C++', 'JavaScript'];

if (checkExist(arr, 'JavaScript')) {
    console.log("yes");
}
else {
    console.log("no"); 
}
 
 
    
/*
run:  
   
yes 
    
*/

 

70+ SQL courses for beginners and professionals