Find Function and find index

 Find function helps you to matches an array it automatically get break when he find the first number 

in this case 3 is first no.

The find() method returns the value of the first element in an array that pass a test (provided as a function).

The find() method executes the function once for each element present in the array:

• If it finds an array element where the function returns a true value, find() returns the value of that array element (and does not check the remaining values)
• Otherwise it returns undefined

Note: find() does not execute the function for empty arrays.

Note: find() does not change the original array.

let a = [12,3,4,5,5];

let number = a.find(function(num){

  return num<10;

})

console.log(number);

findindex ;- 

The findIndex() method returns the index of the first element in an array that pass a test (provided as a function).

The findIndex() method executes the function once for each element present in the array:

• If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not check the remaining values)
• Otherwise it returns -1

Note: findIndex() does not execute the function for array elements without values.

Note: findIndex() does not change the original array.

n this case 1 is first no.

let a = [12,3,4,5,5];

let number = a.findIndex(function(num){

  return num<10;

})

in this case we will get the index of the number