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Archive for November, 2011

Javascript Number roundToPrecision

by webdood on Nov.17, 2011, under Javascript, Numbers

Needed a cross-browser function round to a given precision. Cannot rely on toFixed()

Number.prototype.roundToPrecision = function( precision ) {
  if (precision===undefined) { precision = 2; }
  var multiplier = Math.pow(10,precision);
  return Math.round(this*multiplier)/multiplier;
}
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Javascript Number ensureDecimalPlaces

by webdood on Nov.17, 2011, under Arrays, Javascript, Numbers

Needed a function ensure that a certain number of digits appeared after a decimal point today.

For instance 1.3 should be 1.300, 1 should be 1.000 etc.

Number.prototype.ensureDecimalPlaces = function( decimals ) {
  var tempString = this.toString(),
      pileOfPads = "000000000000000000000000",
      decimalLocation = tempString.indexOf('.');
  if (decimalLocation === -1) {
    retVal = tempString + '.' + pileOfPads.substring(0,decimals);
  } else {
    retVal = tempString + pileOfPads;
    retVal = retVal.substring(0,decimalLocation+decimals+1);
  }
  return retVal;
}

Example use:

var x = 12.3
console.log(x.ensureDecimalPlaces(3)) returns 12.300

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