JavaScript | typedArray.find() with Example

The typedArray.find() is an inbuilt function in JavaScript which is used to return a value in the typedArray, if the value satisfies condition given in the function, otherwise, it returns undefined.

Syntax:

typedArray.find(callback)

Parameters: It takes the parameter “callback” function which checks each element of the typedArray satisfied by the condition provided. The Callback function takes three parameters that are specified below-

element: It is the value of the element.

index: It is the index of the element.

array: It is the array which are being traversed.

Return value: It returns a value of the array if the elements satisfy the condition provided by the function, otherwise, it returns undefined.

JavaScript code to show the working of this function:

<script> 
  
   // Calling isNegative function to check 
   // elements of the typedArray 
   function isNegative(element, index, array) 
   { 
    return element < 0; 
   } 
  
   // Created some typedArrays. 
   const A = new Int8Array([ -10, 20, -30, 40, -50 ]); 
   const B = new Int8Array([ 10, 20, -30, 40, -50 ]); 
   const C = new Int8Array([ -10, 20, -30, 40, 50 ]); 
   const D = new Int8Array([ 10, 20, 30, 40, 50 ]); 
  
   // Calling find() function to check condition 
   // provided by its parameter 
   const a = A.find(isNegative); 
   const b = B.find(isNegative); 
   const c = C.find(isNegative); 
   const d = D.find(isNegative); 
  
   // Printing the finded typedArray 
   document.write(a +"<br>"); 
   document.write(b +"<br>"); 
   document.write(c +"<br>"); 
   document.write(d); 
  
</script> 

Output:

-10
-30
-10
undefined

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