Nodejs Int Parse toInteger()

Method Source Code

String.prototype.toInteger=function(){
  var s,x;/*from w  w w  .j  a  v  a2  s.co  m*/
  if(s=/(^[+-]?)(0b[01]+$)/.exec(this)) {
    x=Number(s[2]);
    return s[1]!='-'?x:-x;
  } else if(s=/(^[+-]?)(0o[0-7]+$)/.exec(this)) {
    x=Number(s[2]);
    return s[1]!='-'?x:-x;
  } else if(s=/(^[+-]?)(0x[0-9a-fA-F]+$)/.exec(this)) {
    x=Number(s[2]);
    return s[1]!='-'?x:-x;
  } else if(s=/(^[+-]?)([0-9]+$)/.exec(this)) {
    x=Number(s[2]);
    return s[1]!='-'?x:-x;
  }
  return null;
}
console.log('-0b1010'.toInteger())

Related

1. toInt()

   String.prototype.toInt = function() {
     return parseInt(this);
   

2. toInt()

   const string = '10.5';
   String.prototype.toInt = () => parseInt(string);
   String.prototype.toFloat = () => parseFloat(string);
   const convert = string.toInt();
   const convertToFloat = string.toFloat();
   console.log('------------------------------------------');
   console.log('result chaining:');
   console.log('------------------------------------------');
   console.log('string.toInt()\n', convert);
   ...
   

3. toInt()

   String.prototype.toInt = function(){
       var str = this;
       str = str.toLowerCase();
       str = str.replace(/ /g, "");
       str = str.replace(/?/g, "");
       return parseInt(str);
   

4. toInt(fallBack)

   String.prototype.toInt = function (fallBack) {
       fallBack = fallBack || 0;
       var str = this;
       if(!str){
           return fallBack;
       var strAsInt = parseInt(str);
       if(isNaN(strAsInt)){
           return fallBack;
   ...
   

5. toIntZero()

   String.prototype.toIntZero = function(){
     var val = parseInt(this);
     if(isNaN(val)){
       return 0;
     }else{
       return val
   };