Nodejs String Format formatString(input)

Method Source Code

// Problem 1. Format with placeholders

// Write a function that formats a string. The function should have placeholders, as shown in the example
// Add the function to the String.prototype
// Example:/*from ww  w .j  av  a2  s .c  om*/

// input   
//var options = {name: 'John'};
// 'Hello, there! Are you #{name}?'.format(options);

//var options = {name: 'John', age: 13};
// 'My name is #{name} and I am #{age}-years-old').format(options);

//output
//'Hello, there! Are you John'

//'My name is John and I am 13-years-old'
String.prototype.formatString = function(input) {
    return this.replace(/(?:#{(\w+)})/g, function($0, $1) {
        return input[$1];
    });
};

var options = {
    name: 'John'
};
console.log('Hello, there! Are you #{name}?'.formatString(options));

var secondOption = {
    name: 'John',
    age: 13
};
console.log('My name is #{name} and I am #{age}-years-old'.formatString(secondOption));

Related

1. formatMoney()

   String.prototype.formatMoney = function() {
       return "$" + this.substr(0, this.length - 2) + "." + this.substr(this.length - 2);
   

2. formatMoney(c, d, t)

   String.prototype.formatMoney = function(c, d, t){
     var n = this, 
     c = isNaN(c = Math.abs(c)) ? 2 : c, 
     d = d == undefined ? "," : d, 
     t = t == undefined ? "." : t, 
     s = n < 0 ? "-" : "", 
     i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
     j = (j = i.length) > 3 ? j % 3 : 0;
    return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
   ...
   

3. formatPV(args)

   String.prototype.formatPV = function(args) {
     if (!args) return this;
     var str = this;
     for (var arg in args) {
       str = str.replace(
         RegExp("\\{\\{" + arg + "\\}\\}", "gi"), args[arg]);
     return str;
   };
   ...
   

4. formatPhone()

   String.prototype.formatPhone = function () {
       var re = /\(?(\d{3})\)?[- ]?(\d{3})[- ]?(\d{4})/g;
       var subst = '$1-$2-$3';
       return this.replace(re, subst);
   };
   

5. formatSeconds()

   String.prototype.formatSeconds = function () {
       var sec_num = parseInt(this, 10);
       var days    = Math.floor(sec_num / 86400);
       var hours   = Math.floor((sec_num - (days * 86400)) / 3600);
       var minutes = Math.floor((sec_num - (days * 86400  + hours * 3600)) / 60);
       var seconds = sec_num - (days * 86400) - (hours * 3600) - (minutes * 60);
       var time = '';
       if (days > 0) { time += days + 'd '; }
       time += hours + 'h ' + minutes + 'm ' + seconds + 's';
   ...
   

6. formatString(num, comma)

   Number.prototype.formatString = function(num, comma) {
     return this.toFixed(num).toString().replace(/\.([0-9]*)$/, comma+"$1");
   

7. format()

   String.prototype.format = String.prototype.f = function () {
       var s = this,
           i = arguments.length;
       while (i--) {
           s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
       return s;
   };
   

8. format()

   String.prototype.format = String.prototype.f = function () {
       var args = arguments;
       return this.replace(/\{\{|\}\}|\{(\d+)\}/g, function (m, n) {
           if (m == "{{") { return "{"; }
           if (m == "}}") { return "}"; }
           return args[n];
       });
   };
   

9. format()

   String.prototype.format = String.prototype.f = function () {
       var s = this,
           i = arguments.length;
       while (i--) {
           s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
       return s;
   };