Using the ternary operator in assignment and return
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Posted on We can use the ternary operator to assign variables or even as part of return statements. The if-else version of achieving the same result would often take a lot more lines of code.
The ternary operator can also help us make some arrow functions even shorter.
const isEven = n => n % 2 === 0
/*
* Conditionally assigning a value to a variable
*/
// before
let numberType
if (isEven(35)) {
numberType = "even"
} else {
numberType = "odd"
}
// after
const numberType = isEven(35) ? "even" : "odd"
/*
* Conditionally returning a result in a function
*/
// before
const getNumberType = number => {
if (isEven(number)) {
return "even"
} else {
return "odd"
}
}
// after
const getNumberType = number => {
return isEven(number) ? "even" : "odd"
}
// after (with implicit return)
const getNumberType = number => isEven(number) ? "even" : "odd"const isEven = n => n % 2 === 0
/*
* Conditionally assigning a value to a variable
*/
// before
let numberType
if (isEven(35)) {
numberType = "even"
} else {
numberType = "odd"
}
// after
const numberType = isEven(35) ? "even" : "odd"
/*
* Conditionally returning a result in a function
*/
// before
const getNumberType = number => {
if (isEven(number)) {
return "even"
} else {
return "odd"
}
}
// after
const getNumberType = number => {
return isEven(number) ? "even" : "odd"
}
// after (with implicit return)
const getNumberType = number => isEven(number) ? "even" : "odd"const isEven = n => n % 2 === 0
/*
* Conditionally assigning a value to a variable
*/
// before
let numberType
if (isEven(35)) {
numberType = "even"
} else {
numberType = "odd"
}
// after
const numberType = isEven(35) ? "even" : "odd"
/*
* Conditionally returning a result in a function
*/
// before
const getNumberType = number => {
if (isEven(number)) {
return "even"
} else {
return "odd"
}
}
// after
const getNumberType = number => {
return isEven(number) ? "even" : "odd"
}
// after (with implicit return)
const getNumberType = number => isEven(number) ? "even" : "odd"const isEven = n => n % 2 === 0
/*
* Conditionally assigning a value to a variable
*/
// before
let numberType
if (isEven(35)) {
numberType = "even"
} else {
numberType = "odd"
}
// after
const numberType = isEven(35) ? "even" : "odd"
/*
* Conditionally returning a result in a function
*/
// before
const getNumberType = number => {
if (isEven(number)) {
return "even"
} else {
return "odd"
}
}
// after
const getNumberType = number => {
return isEven(number) ? "even" : "odd"
}
// after (with implicit return)
const getNumberType = number => isEven(number) ? "even" : "odd"