Question

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

Answer 1

function checkExist(arr: string[], val: string) {
    return arr.some(arr_value => val === arr_value);
}

const arr: string[] = ['TypeScript', 'PHP', 'C#', 'Java', 'C++'];
  
if (checkExist(arr, 'TypeScript')) {
    console.log("yes");
}
else {
    console.log("no"); 
}
 
 
    
/*
run:  
   
"yes" 
    
*/

 

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