Array – Exercise

by jordwms

JavaScript

/**
 * Array – Exercise
 * 
 * Use only array instance methods!
 
 * 1. Filter arr1 to only contain only even values
 * 2. Reverse order the values of in arr1
 * 3. Combine both arr1 and arr2 together, then loop through each value and
 *    log each value to the console
 *
 * Bonus: Using Array.sort and a custom sorter function, sort arr2 by 
 *        length of value, descending
 */
 var arr1 = [1,2,3,4,5,6,7,8,9,0];
 var arr2 = ['aa','b','cccc','dddddd','eeee','fffff'];

var myArrayLiteralEvens = arr1.filter(function(n) {
	return n % 2 === 0;
});

console.group("#1");
console.log(myArrayLiteralEvens);
console.groupEnd();

// #2
console.group("#2");
console.log(arr1.reverse());
console.groupEnd();

// #3
var myCombinedArr = arr1.concat(arr2);

console.group("#3");
myCombinedArr.forEach(function(currentValue, index, arr) {
   console.log(currentValue); 
});
console.groupEnd();

console.group("Bonus");
var bonusArr = arr2.sort(function(a, b){
	if(a.length < b.length) {
        return 1;   
    } 
    if(a.length > b.length) {
    	return -1;
    }
    
    return 0;
});
console.log(bonusArr);
console.groupEnd();