codewars练习（javascript）-2021/6/1

codewars-js练习

2021/6/1

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Remove First and Last Character】

example：

abcd --> bc

solution

function removeChar(str) {
  return str.slice(1, -1);
}

【2】<7kyu>【Powers of i】

i is the imaginary unit, it is defined by i² = -1, therefore it is a solution to x²+1=0.

example：

pofi(0),'1'
pofi(1),'i'
pofi(2),'-1'
pofi(3),'-i'
pofi(4),'1'
pofi(5),'i'

solution

function pofi(n){
  return ["1","i","-1","-i"][n%4];
}