这个比较变量代码的简写形式是什么？(What is the short form of this compare variable code)

这个比较变量代码的简写形式是什么？(What is the short form of this compare variable code)

有什么方法可以将这两个代码合并为一个？ 我想检查一些变量是否等于0或等于1或等于2或大于2且小于5或大于5.我应该为每个变量编写一个代码还是可以为所有变量编写代码？

<script> if (NRIRDL==0){ XRIRDL=0; } else if (NRIRDL == 1){ XRIRDL = 1; } else if (NRIRDL == 2){ XRIRDL = 1.8; } else if (NRIRDL > 2 && NRIRDL < 5){ XRIRDL = 0.9 * NRIRDL; } else { XRIRDL = NRIRDL - 1; } // code below is the same as code above, but variables are different. if (NRIRDR==0){ XRIRDR=0; } else if (NRIRDR == 1){ XRIRDR = 1; } else if (NRIRDR == 2){ XRIRDR = 1.8; } else if (NRIRDR > 2 && NRIRDR < 5){ XRIRDR = 0.9 * NRIRDR; } else { XRIRDR = NRIRDR - 1; } </script>

Is there a way that I can combine these two codes into one? I want to check if some variables are equal to 0 or equal to 1 or equal to 2 or greater than 2 and less than 5 or greater than 5. Should I write a code for each variable or I can write a code for all variables?

<script> if (NRIRDL==0){ XRIRDL=0; } else if (NRIRDL == 1){ XRIRDL = 1; } else if (NRIRDL == 2){ XRIRDL = 1.8; } else if (NRIRDL > 2 && NRIRDL < 5){ XRIRDL = 0.9 * NRIRDL; } else { XRIRDL = NRIRDL - 1; } // code below is the same as code above, but variables are different. if (NRIRDR==0){ XRIRDR=0; } else if (NRIRDR == 1){ XRIRDR = 1; } else if (NRIRDR == 2){ XRIRDR = 1.8; } else if (NRIRDR > 2 && NRIRDR < 5){ XRIRDR = 0.9 * NRIRDR; } else { XRIRDR = NRIRDR - 1; } </script>

最满意答案

实际上，它可以用三元运算符写成更短，并且没有多个条件，请检查：

function getValue(n) {
    return n >= 2 && n < 5 ? n * 0.9 : n == 0 ? 0 : n == 1 ? 1 : n - 1;
}

var var1 = 0; 
var var2 = 1;
var var3 = 2;
var var4 = 3;
var var5 = 5;
console.log(getValue(var1)); // outputs 0
console.log(getValue(var2)); // outputs 1
console.log(getValue(var3)); // outputs 1.8
console.log(getValue(var4)); // outputs 2.7
console.log(getValue(var5)); // outputs 4 
  
 
 
 只需使用getValue(n)函数：传递您的变量，它将返回可以存储到另一个变量中的所需值，如var XRIRDL = getValue(NRIRDL); 或var XRIRDR = getValue(NRIRDR); 
actually, it can be written shorter with ternary operator and without multiple if conditions, check it out:
 
 
 
  
  
function getValue(n) {
    return n >= 2 && n < 5 ? n * 0.9 : n == 0 ? 0 : n == 1 ? 1 : n - 1;
}

var var1 = 0; 
var var2 = 1;
var var3 = 2;
var var4 = 3;
var var5 = 5;
console.log(getValue(var1)); // outputs 0
console.log(getValue(var2)); // outputs 1
console.log(getValue(var3)); // outputs 1.8
console.log(getValue(var4)); // outputs 2.7
console.log(getValue(var5)); // outputs 4 
  
 
 
Just use getValue(n) function: pass your variable and it will return needed value that can be stored into another variable like var XRIRDL = getValue(NRIRDL); or var XRIRDR = getValue(NRIRDR);