Array Problem Set

// Here are 4 problems abour array iteration, and some of them involve forEach and some don't.
// Unfortunately I only managed to solve the last one on my own (part of...)

//printReverse: print out elements in an array in reverse order
function printReverse(arr) {
	for(var i = arr.length - 1; i>=0; i--) {
		console.log(arr[i])
    }
}

//isUniform: return true if all elements in an array are identical
function isUniform(arr) {
	var first = arr[0]
	for(var i = 1; i<arr.length; i++) {
		if(arr[i] !== first) {
			return false
		} 
	}
	return true
}

//sumArray: return the sum of all elements in the array
function sumArray(arr) {
	var total = 0
	arr.forEach(function(element) {
		total += element
	})
	return total
}

//max: return the maximum number in the array
function max(arr) {
	var max =arr[0]
	for(var i =1; i<arr.length; i++ ) {
		if(arr[i]>max) {
			max = arr[i]
		}
	}
	return max
}