从字符串数组中删除第一个“单词”

Question

I have a simple array of strings

var myArray= ["This is","a game","worth playing"];

I have tried this

console.log(myArray.map(function(f){ return f.substring(myArray.indexOf(" ") + 1);}));

which ofcourse is not working.

My Expected Output:

is game playing

I need this in pure JavaScript, not jQuery.

Answer 1

You have to look for " " in the array elements, not in tha array itself. Change ( myArray.indexOf(" ") to f.indexOf(' ') .

 var myArray= ["This is","a game","worth playing"]; console.log(myArray.map(f => f.substring(f.indexOf(' ') + 1)).join(' ')); 

Answer 2

I'm not sure why everyone is complicating the situation with their answers... it's a simple case of using indexOf on the wrong variable...

This line:

console.log(myArray.map(function(f){ return f.substring(myArray.indexOf(" ") + 1);}));

Should be:

console.log(myArray.map(function(f){ return f.substring(f.indexOf(" ") + 1);}));

You want the index of the space inside the current string that you are checking, but you were calling indexOf on the original array, which of course returns -1 because the value is not found.

Additionally, if you want the output to be exactly like your expected output statement, you will need to use .join() on the result:

 var myArray= ['This is', 'a game', 'worth playing']; console.log(myArray.map(function(f){ return f.substring(f.indexOf(' ') + 1);}).join(' ')); 

Answer 3

The problem is that your .indexOf is returning -1 for each of your spaces in your array. This is because you String.indexOf() and Array.indexOf() are two different methods.

To resolve this, how about simply looping over each of the elements in the array and then dealing with them individually, setting each of them to be equal to second word?

 var myArray = ["This is", "a game", "worth playing"]; for (var i = 0; i < myArray.length; i++) { myArray[i] = myArray[i].substr(myArray[i].indexOf(" ") + 1); } console.log(myArray); console.log(myArray.join(' ')); 

Answer 4

This one match your expected output:

 var myArray= ["This is","a game","worth playing"]; console.log(myArray.map((item) => { return item.replace(/\\w+\\s*/i, "") }).join(" ")) 

Or this one without "join":

 var myArray= ["This is","a game","worth playing"]; console.log(myArray.map((item) => { return item.replace(/\\w+\\s*/i, "") })) 

Answer 5

You had to save the array processed with map into a variable.

The map() method creates a new array with the results of calling a provided function on every element in the calling array ( source ).

 var myArray= ["This is","a game","worth playing"]; myArray = myArray.map(function(str){ return str.substring(str.indexOf(" ") + 1) }); // as array console.log(myArray); // as string console.log(myArray.join(' ')); 

Answer 6

function removeFirstWordFromArrayOfWords(array) {
  return array.map(item => {
    return item.split(' ').slice(1);
  }).join(' ');
}

Which will give you

> var myArray= ["This is","a game","worth playing"];
> removeFirstWordFromArrayOfWords(myArray)
is game playing

This may not be the simplest or fastest