Nodejs String Format format(params)

Method Source Code

//Problem 1. Format with placeholders
////from  w ww .  java 2s.  c  o  m
//    Write a function that formats a string. The function should have placeholders, as shown in the example
//Add the function to the String.prototype

String.prototype.format = function (params) {
    'use strict';

    var p,
        regex,
        result;

    result = this;

    for (p in params) {
        if (params.hasOwnProperty(p)) {
            regex = new RegExp('#{' + p + '}', 'g');
            result = result.replace(regex, params[p]);
        }
    }

    return result;
}

function problem01_FormatWithPlaceholders() {
    'use strict';
    var options = {name: 'John'};
    console.log('Hello, there! Are you #{name}?'.format(options));

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

Related

1. format(opts)

   String.prototype.format = function(opts) {
       var source = this,
           data = Array.prototype.slice.call(arguments, 0),
           toString = Object.prototype.toString;
       if (data.length) {
           data = data.length == 1 ?
               (opts !== null && (/\[object Array\]|\[object Object\]/.test(toString.call(opts))) ? opts : data) : data;
           return source.replace(/%\{(.+?)\}/g, function(match, key) {
               var replacer = data[key];
   ...
   

2. format(param)

   String.prototype.format = function(param) {
       var formatted = this;
       for(i in param ){
           var regexp = new RegExp('\\{'+i+'\\}', 'gi');
           formatted = formatted.replace(regexp, param[i]);
       return formatted;
   };
   

3. format(parameters)

   var FORMAT_PARAMETER_PATTERN;
   FORMAT_PARAMETER_PATTERN = /\@\(([a-zA-Z](?:[a-zA-Z0-9_]*))\)/g;
   String.prototype.format = function(parameters) {
     var value;
     value = this.valueOf();
     return value.replace(FORMAT_PARAMETER_PATTERN, function(match, name) {
       var _ref;
       return (_ref = parameters != null ? parameters[name] : void 0) != null ? _ref : "<>";
     });
   ...
   

4. format(params)

   String.prototype.format = function(params) {
     if (!params) {throw new Error('No arguments passed');}
     return this.replace(/\{([a-zA-Z0-9]+)\}/g, function() {
       var key = arguments[1];
       if (params.hasOwnProperty(key)) {
         return params[key];
       } else {
         return arguments[0];
     });
   };
   

5. format(params)

   String.prototype.format = function(params){
     var formatted = this;
     var fn = function(key, value){
       var regexp = new RegExp('\\{' + key + '\\}', 'gi');
       formatted = formatted.replace(regexp, value);
     };
     if (typeof(params) == 'object') {
       for (var x in params) {
         fn(x, params[x]);
   ...
   

6. format(params)

   String.prototype.format = function (params){
       var reg = /{(\d+)}/gm;
       return this.replace(reg,function(match,name){
           return params[~~name];}
       );
   };
   

7. format(string)

   function ms_to_days(m) {
     return Math.floor(m / (86400 * 1000) + 0.5)
   function date_period_to_ms(dp) {
     var ym = dp.split('-', 2)
     return new Date(ym[0], parseInt(ym[1], 10) - 1, 1);
   Date.prototype.format = function (string) {  
     string = string.replace(/%b/, I18n.t('date.abbr_month_names')[this.getMonth() + 1], 'g');
   ...
   

8. format(substitutions)

   String.prototype.format = function(substitutions) {
     return this.replace(/\{([A-Za-z0-9]+)\}/g, function(match, key) {
       return substitutions[key] !== undefined ? substitutions[key] : '';
     });
   };
   

9. format(substitutions)

   String.prototype.format = function(substitutions) {
     return this.replace(/\{([A-Za-z0-9]+)\}/g, function(match, key) { 
       return substitutions[key] !== undefined ? substitutions[key] : '';
     });
   };