Question 209519 in Javascript Question posted in
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Working with a number of variables at a time in JavaScript

I have these 10 variables already declared and they each contain a float value.

Is there any way to apply the function toFixed(prec) with prec as the parameter to all these variables with a shorter code? Using an array or something like that?

x1 = x1.toFixed(prec);
x2 = x2.toFixed(prec);
y1 = y1.toFixed(prec);
y2 = y2.toFixed(prec);
a1 = a1.toFixed(prec);
a2 = a2.toFixed(prec);
b1 = b1.toFixed(prec);
b2 = b2.toFixed(prec);
c1 = c1.toFixed(prec);
c2 = c2.toFixed(prec);
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2

Answers


  1. 0

    Yes, you should keep all these parameters in object (as associative array in other language), than you can simply loop that object.

    /**
Replace this:
x1=x1.toFixed(prec);
x2=x2.toFixed(prec);
y1=y1.toFixed(prec);
y2=y2.toFixed(prec);
a1=a1.toFixed(prec);
a2=a2.toFixed(prec);
b1=b1.toFixed(prec);
b2=b2.toFixed(prec);
c1=c1.toFixed(prec);
c2=c2.toFixed(prec);

with this:
*/

let options = {
  x1: 1.0,
  x2: 2.0,
  x3: 3.0,
}

console.log('Before', options);

for (const [key, value] of Object.entries(options)) {
  options[key] = value.toFixed(3);
}

console.log('After', options);
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  2. 0

    Put the variables into an array, map it and destructure:

    [x1, x2, y1, y2, ...] = [x1, x2, y1, y2, ...].map(num => num.toFixed(prec));
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