console.log('hello world');



let countries=[ 'US','PH','CAN','SG','TH','PH','FR','DE'];

let indexOfArray= countries.indexOf('PH');
console.log('Resullt of IndexOf method:');
console.log(indexOfArray);

let slicedArrayA = countries.slice(2);
console.log('Resullt of slice method:');
console.log(slicedArrayA);



let taskArrayA= [ 'dring html','eat javascript'];
let taskArrayB= [ 'dring html','eat javascript'];
let taskArrayC= [ 'dring html','eat javascript'];

let task=taskArrayA.concat(taskArrayB);
console.log('Resullt of concat method:');
console.log(task);

let user= [ 'john','jane','joe','jobert'];

console.log('Resullt of join method:');
console.log(user.join());
console.log(user.join(' -'));
console.log(user.join(' /'));


user.forEach( function(task){
	console.log(task)
});

let numbers = [ 1,2,3,4,5];


let numberMap = numbers.map(function(number){
	return number * number;
});

console.log('Original Array');
console.log(numbers);
console.log(numberMap);


let checkedAll= numbers.every(function(number){
	return(number < 3);
});
console.log('Results of every method');
console.log(checkedAll);

let someAll= numbers.some(function(number){
	return(number < 2);
});
console.log('Results of every method');
console.log(someAll);

if(someAll){
	console.log('some numbers in the array are greater than 2');
}

let filteredAll= numbers.filter(function(number){
	return(number == 0);
});
console.log('Results of filter method');
console.log(filteredAll);


let products= [ 'mouse','keyboard','laptop','monitor'];

let product1=products.includes('mouse');
console.log(product1);

let product2=products.includes('keyboard');
console.log(product2);


let includeAll= products.includes(function(products){
	console.log(includeAll)
});
console.log('Results of filter method');
console.log(filteredAll);