Nodejs String Format format(dict)

Method Source Code

// variadic arguments
String.prototype.format = function(dict) {
  var result = this;

  if(typeof(dict) === "object") {
    Object.keys(dict).forEach(function(key) {
      result = result.replace("{" + key + "}", dict[key]);
    });/*from  w  ww . j av  a 2 s . co  m*/
    return result;
  }

  var args = [];
  var n = arguments.length;
  var i = 0;

  for(i; i < n; i+=1) {
    args.push(arguments[i]);
  }

  var result = this;

  args.forEach(function(arg) {
    result = result.replace("{}", arg);
  });

  return result;
}

console.log("{} {} {}".format("one", "two", "three"));
console.log("Hello {name}, I am {friend}".format({
  "name": "Ivo",
  "friend": "Rado"
}));

Related

1. format(args)

   String.prototype.format = function(args)
       var result = this;
       if (arguments.length > 0)
           var reg;
           if (arguments.length == 1 && typeof(args) == "object")
               for (var key in args)
   ...
   

2. format(args)

   String.prototype.format = function (args) {
       var newStr = this;
       for (var key in args) {
           newStr = newStr.replace('{' + key + '}', args[key]);
       return newStr;
   

3. 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
       ;
     });
   };
   

4. 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;
     });
   ...
   

5. format(data)

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

6. 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(),
   ...
   

7. format(format)

   String.prototype.format = function (format) {
       const holders = JSON.parse(format),
           regex = new RegExp('(#{(\\w+)})', 'g');
       let transformed = this,
           currentMatch = '';
       while ((currentMatch = regex.exec(this)) !== null) {
           transformed = transformed.replace(currentMatch[1], holders[currentMatch[2]]);
       return transformed;
   ...
   

8. 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 () {
   ...
   

9. 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;
   }();