Custom some prototype

array-prototype-some.js

// Create our custom some function and attach it to the prototype
Array.prototype.customSome = function(callback) {
  const arr = this;
  
  for(let i = 0; i < arr.length; i++) {
    if(callback(arr[i], i, arr)) return true;
  }
  
  return false;
}

// Execute our custom some function
const beachArr = ['waves', 'sharks', 'jellies', 'sand', 'pelicans'];
const customSomeResult = beachArr.customSome(item => item === 'sharks');

// true
console.log(`Our custom some result: ${customSomeResult}`);