Custom find prototype

array-prototype-find.js

// Create our custom find function and attach it to the prototype
Array.prototype.customFind = function(callback) {
  const arr = this;
  
  for (let i = 0; i < arr.length; i++) {
    if (callback(arr[i], i, arr)) return arr[i];
  }
        
  return false;
}
        
// Execute our custom find function
const beachArr = ['waves', 'sharks', 'jellies', 'sand', 'pelicans'];
const customFindResult = beachArr.customFind(item => item.length === 4);
    
// sand
console.log(`Our custom find result: ${customFindResult}`);