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[JS101] 用 JavaScript 一步步打造程式基礎 - 練習題(一)
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/*判斷第一位是否為大寫字母*/ | |
function isUpperCase(str){ | |
var key = str[0] | |
return key >= "A" && key <= "Z" | |
} | |
console.log(isUpperCase("Abcd")) | |
/*判斷第一個大寫字母的位置,並回傳其位置*/ | |
function position(str){ | |
for(var i=0; i < str.length; i++){ | |
if(str[i] >= "A" && str[i] <= "Z"){ | |
return str[i] + ' ' + i | |
} | |
} | |
return -1 | |
} | |
var a = position('abcd') | |
console.log(a) | |
/*回傳陣列裡小於N的數的數量*/ | |
function findSmallCount(arr,num){ | |
var result = 0 | |
for(var i = 0; i < arr.length; i++){ | |
if(arr[i] < num){ | |
result += 1 | |
} | |
} | |
return result | |
} | |
console.log(findSmallCount([1,2,3],2)) | |
/*回傳陣列裡小於N的數,並照原順序存成一個新陣列*/ | |
function findAllSmall(arr,num){ | |
var result = [] | |
for(var i = 0; i < arr.length; i++){ | |
if(arr[i] < num){ | |
result.push(arr[i]) | |
} | |
} | |
return result | |
} | |
console.log(findAllSmall([1,3,5,4,2],4)) |
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