Nodejs String Format format(format)

Method Source Code

String.prototype.format = function (format) {

    const holders = JSON.parse(format),
        regex = new RegExp('(#{(\\w+)})', 'g');

    let transformed = this,/*from   w  w  w  .java  2 s .c o m*/
        currentMatch = '';

    while ((currentMatch = regex.exec(this)) !== null) {
        transformed = transformed.replace(currentMatch[1], holders[currentMatch[2]]);
    }

    return transformed;
}

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

Related

1. format(args, index)

   String.prototype.format = function(args, index) {
     return this.replace(/{(\w+)}/g, function(match, number) {
       return typeof args[index[number]] != 'undefined'
         ? args[index[number]]
         : match
       ;
     });
   };
   

2. format(ctx)

   String.prototype.format = function (ctx) {
     return this.replace(/\$\{([\w\.]+)\}/g, function(all, varname) {
       var keys = varname.split('.');
       var val = null;
       for (var i = 0, len = keys.length; i < len; i++) {
         val = ctx[keys[i]];
       return val;
     });
   ...
   

3. format(data)

   String.prototype.format = function(data) {
       return this.replace(/{(.+?)}/g, function(match, name) {
           return data[name] || match;
       });
   };
   

4. format(dict)

   String.prototype.format = function(dict) {
     var result = this;
     if(typeof(dict) === "object") {
       Object.keys(dict).forEach(function(key) {
         result = result.replace("{" + key + "}", dict[key]);
       });
       return result;
     var args = [];
   ...
   

5. format(fmt)

   String.prototype.format = function (fmt) {
       if (fmt==null) fmt = "yyyy-MM-dd";
       var myDate = new Date(this);
       var o = {
           "M+": myDate.getMonth() + 1,
           "d+": myDate.getDate(),
           "h+": myDate.getHours(),
           "m+": myDate.getMinutes(),
           "s+": myDate.getSeconds(),
   ...
   

6. format(format)

   String.format = function (format) {
       var args = Array.prototype.slice.call(arguments, 1);
       return format.replace(/{(\d+)}/g, function (match, number) {
           return typeof args[number] != 'undefined'
           ? args[number]
           : match;
       });
   };
   String.prototype.format = function () {
   ...
   

7. format(i, safe, arg)

   String.prototype.format = function(i, safe, arg) {
     function format() {
       var str = this, len = arguments.length+1;
       for (i=0; i < len; arg = arguments[i++]) {
         safe = typeof arg === 'object' ? JSON.stringify(arg) : arg;
         str = str.replace(RegExp('\\{'+(i-1)+'\\}', 'g'), safe);
       return str;
     format.native = String.prototype.format;
     return format;
   }();
   

8. format(i, safe, arg)

   String.prototype.format = function(i, safe, arg) {
     function format() {
       var str = this, len = arguments.length+1;
       for (i=0; i < len; arg = arguments[i++]) {
         safe = typeof arg === 'object' ? JSON.stringify(arg) : arg;
         str = str.replace(RegExp('\\{'+(i-1)+'\\}', 'g'), safe);
       return str;
     format.native = String.prototype.format;
     return format;
   }();
   

9. format(o)

   String.prototype.format = function (o) {
       return this.replace(/{([^{}]*)}/g,
           function (a, b) {
               var r = o[b];
               return typeof r === 'string' || typeof r === 'number' ? r : a;
       );
   };