Nodejs Array Index indexOf(elt /*, from*/)

Here you can find the source of indexOf(elt /*, from*/)

Method Source Code

Array.prototype.indexOf = function(elt /*, from*/) {
   //from  ww w .  j  a va 2  s . c  o m
   var len = this.length;

   var from = Number(arguments[1]) || 0;
   from = (from < 0) ? Math.ceil(from) : Math.floor(from);
   
   if (from < 0) {
      from += len;
   }

   for (; from < len; from++) {
      if (from in this && this[from] === elt) {
         return from;
      }
   }
   
   return -1;
   
};

Related

  1. indexOf(el/*, from*/)
    Array.prototype.indexOf = Array.prototype.indexOf || function(el) {
      var len = this.length >>> 0;
      var from = Number(arguments[1]) || 0;
      from = (from < 0) ? Math.ceil(from) : Math.floor(from);
      if (from < 0) from += len;
      for (; from < len; from++) {
        if (from in this && (this[from] === el)) {
          return from;
      return -1;
    };
    String.prototype.capitalize = function() {
      return this.replace(/\w+/g, function(str) {
        return (str.charAt(0).toUpperCase() + str.substr(1));
      });
    };
    String.prototype.trim = function() {
      return this.replace(/^\s+|\s+$/g, '');
    };
    
  2. indexOf(elem)
    Array.prototype.indexOf = Array.prototype.indexOf || function(elem) {
      for(var i in this){
        if(this[i] === elem) return true;  
      return false;
    };
    
  3. indexOf(elem)
    Array.prototype.indexOf = function(elem) {
      for (var i = 0; i < this.length; i++) {
        if (this[i] == elem) {
          return i;
      return -1;
    };
    
  4. indexOf(elem, from)
    Array.prototype.indexOf = function(elem, from) {
      if (from == null) {
        from = 0;
      } else if (from < 0) {
        from = Math.max(0, this.length + from);
      for (var i = from, len = this.length; i < len; i++) {
        if (this[i] === elem) {
          return i;
    ...
    
  5. indexOf(element)
    Array.prototype.indexOf = function(element){
        for(var i = 0; i < this.length; i++){
            if(this[i] == element){return i;}
        return -1;
    };
    
  6. indexOf(elt /*, from*/)
    Array.prototype.indexOf = function(elt )
        var len = this.length;
        var from = Number(arguments[1]) || 0;
        from = (from < 0)
             ? Math.ceil(from)
             : Math.floor(from);
        if (from < 0)
          from += len;
    ...
    
  7. indexOf(elt /*, from*/)
    Array.prototype.indexOf = Array.prototype.indexOf || function(elt ) {
        var len = this.length >>> 0;
        var from = Number(arguments[1]) || 0;
        from = (from < 0)
            ? Math.ceil(from)
            : Math.floor(from);
        if (from < 0) {
            from += len;
        for (; from < len; from++) {
            if (from in this &&
                this[from] === elt) {
                return from;
        return -1;
    };
    
  8. indexOf(given, strict)
    Array.prototype.indexOf = function(given, strict) {
      var result = null;
      this.each(function(elem, idx) {
        if (strict) {
          if (elem === given) {
            result = idx;
            return false;
        else {
          if (elem == given) {
            result = idx;
            return false;
      })
      return result;
    
  9. indexOf(item)
    Array.prototype.indexOf = function(item){
      for (var i = 0; i < this.length; i++) {
        if(this[i] === item) return i;
      };
      return -1;
    };