Custom every prototype

array-prototype-every.js

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

// Execute our custom everyfunction
const beachArr = ['waves', 'sharks', 'jellies', 'sand', 'pelicans'];
const customEveryResult = beachArr.customEvery(item => item.length > 2);

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