How can I get every one decimal place number in a string input

January 6, 2022

I have a string

let input = "1.0 2.5 3.0 4.5 5.0 -5.5 4.5 3.0 -2.0 -1.0 1.0 2.0 5.0";

In order to get a number array, I tried to do the following:

let output= input.split(" ").map(Number);

So now i got a number array. However, using the following code, I failed to format all numbers with one decimal place:

for (i = 0; i < output.length; i++) {
  output[i].toFixed(1);
}

let input = "1.0 2.5 3.0 4.5 5.0 -5.5 4.5 3.0 -2.0 -1.0 1.0 2.0 5.0";
let output = input.split(" ").map(Number);
console.log(output); //got a number array

for (i = 0; i < output.length; i++) {
  output[i].toFixed(2);
}

console.log(output); //try to get all numbers with one decimal place,but failed

Can anyone know how to make this? Thanks in advance.

>Solution :

You need an assignment or map the new values.

let input = "1.0 2.5 3.0 4.5 5.0 -5.5 4.5 3.0 -2.0 -1.0 1.0 2.0 5.0";
let output= input.split(" ").map(Number).map(v => v.toFixed(1));

console.log(output);

As mentioned in comments by Terry, you could combine the last both mappings into one.

let input = "1.0 2.5 3.0 4.5 5.0 -5.5 4.5 3.0 -2.0 -1.0 1.0 2.0 5.0";
let output= input.split(" ").map(v => Number(v).toFixed(1));

console.log(output);