[JS101] 用 JavaScript 一步步打造程式基礎 - 迴圈&函式

Example-6.js

/*debugger 除錯用& do/while */
var i = 1
debugger
do {
  console.log(i++)
}while(i <= 100)

console.log("Finished!")

/*for loop 範例*/
var scores = [10,20,30,40,50]
var sum = 0
var avg = 0
for (var i=0; i<scores.length; i++){
	console.log(scores[i])
	sum += scores[i]
}
avg = sum/scores.length
console.log('Total score is '+ sum +'.')
console.log('Average score is '+ avg+'.')

/*function 範例*/
function array(min, max){
  var result = []
  for (var i = min; i<= max; i += 2){
	result.push(i)
  }
  return result
}
console.log(array(1,20))

/*function 可以帶入 function*/
function change(array, trans){
	var result = []
	for(var i = 0; i<array.length; i++){
		result.push(trans(array[i]))
	}
    return result
}

function linear(x){
	return x*2+1
}

console.log(
    change([1,2,3],linear)
)
/*印出橫向的星號*/
function star(num){
	var result = ''
	for (var i = 1; i <= num; i++){
		result += '*'
	}
	return result
}

console.log(star(5))

/*.sort排序，數字由小到大*/
var arr = [ 3, 25, 4, 67]
arr.sort(function(a,b){
	if (a===b) return 0 
	if (b>a) return -1 /*負數不換位置*/
	return 1 /*正數換位置*/
})

console.log(arr)