nixzhu
2013-10-04 21:36:58 +08:00
第五题花比较久的时间，重做了一遍，顺便抄录下来。这好像就是写C的人会写出的风格，没有花哨的东西。最后一题取巧了一点：
第一题：
function doubleInteger(i) {
// i will be an integer. Double it and return it.
return i+=i;
}
第二题：
function isNumberEven(i) {
// i will be an integer. Return true if it's even, and false if it isn't.
return i%2 == 0;
}
第三题：
function getFileExtension(i) {
// i will be a string, but it may not have a file extension.
// return the file extension (with no period) if it has one, otherwise false
var l = i.split('.');
if (l && l.length > 1) {
return l[l.length-1];
} else {
return false;
}
}
第四题：
function longestString(i) {
// i will be an array.
// return the longest string in the array
var str ='';
for (var x=0; x < i.length; x++) {
if (typeof i[x] === 'string' && i[x].length > str.length) {
str = i[x];
}
}
return str;
}
第五题：
function arraySum(i) {
// i will be an array, containing integers, strings and/or arrays like itself.
// Sum all the integers you find, anywhere in the nest of arrays.
var sum = 0;
for (var x=0; x < i.length; x++) {
if (!(typeof i[x] === 'string')) {
if (i[x] instanceof Array) {
sum += arraySum(i[x]);
} else {
sum += i[x];
}
}
}
return sum;
}