convert variable float, integer or left as string directly - Javascript

Question

I want to convert a string variable as follows:

the variable string is a float-> convert to float
else string is an integer-> convert to integer
else return string

This is what I currently tried:

function parse(x){
    return x==parseFloat(x)?parseFloat(x):
           x==parseInt(x)?parseInt(x):
           x
}

console.log(typeof parse("11.5"),parse("11.5"))
console.log(typeof parse("11"),parse("11"))
console.log(typeof parse("11.5A"),parse("11.5A"))

I am looking for solutions if there exists a more efficient and direct way to do this.

More direct? No. (Although parseFloat should suffice for parsing integers as well). More efficient? Don't call parseFloat and parseInt twice, but store the result in a temporary variable. — Bergi
– Bergi, Commented Apr 15, 2020 at 14:40
Does this answer your question? Convert string to either integer or float in javascript — Mickael B.
– Mickael B., Commented Apr 15, 2020 at 14:42
Answers don't direct as mush as my try in the questions. Better be people try something from my try. That's why I posted this questions. — Nilanka Manoj
– Nilanka Manoj, Commented Apr 15, 2020 at 14:55

lucas · Accepted Answer · 2020-04-15 14:57:55Z

0

const parse = x => !isNaN(x) ? Number(x) : x

console.log(parse(1), typeof parse(1))
console.log(parse(1.5), typeof parse(1.5))
console.log(parse('1'), typeof parse('1'))
console.log(parse('1A'), typeof parse('1A'))
console.log(parse(0), typeof parse(0))
console.log(parse('0'), typeof parse('0'))

edited Apr 15, 2020 at 14:57

answered Apr 15, 2020 at 14:45

lucas

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1 Comment

lucas Over a year ago

@Bergi well spotted. fixed.

Nilanka Manoj · Accepted Answer · 2020-04-15 15:18:13Z

0

I found that this is more efficient:

function parse(x){
  return x==x*1?x*1:x
 }

function parse(x){
      return x==x*1?x*1:x
 }
console.log(typeof parse("11.5"),parse("11.5"))
console.log(typeof parse("11"),parse("11"))
console.log(typeof parse("11.5A"),parse("11.5A"))

answered Apr 15, 2020 at 15:18

Nilanka Manoj

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