javascript - replacing spaces with a string

Question

I'm new to Javascript and need a bit of help with program on a college course to replace all the spaces in a string with the string "spaces".

I've used the following code but I just can't get it to work:

<html>
<body>
<script type ="text/javascript">
// Program to replace any spaces in a string of text with the word "spaces".
var str = "Visit Micro soft!";

var result = "";

For (var index = 0; index < str.length ; index = index + 1)
{ 
    if (str.charAt(index)= " ")
    {
        result = result + "space";

    }
    else
    { 
        result = result + (str.charAt(index));

    }

}   

document.write(" The answer is " + result );
</script>
</body>
</html>

you if statement needs a == instead of an =. == is for comparison and = is for saving things inside of variables (assignment) — Cory Danielson, Sep 23 '11 at 13:53

score 5 · Answer 1 · answered Sep 23 '11 at 13:53

5

For

isn't capitalized:

for

and

str.charAt(index)= " "

needs to be:

str.charAt(index) == " "

JavaScript Comparison Operators

for loops

answered Sep 23 '11 at 13:53

Joe

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score 1 · Answer 2 · answered Sep 23 '11 at 13:53

1

As others have mentioned there are a few obvious errors in your code:

The control flow keyword for must be all lower-case.
The assignment operator = is different than the comparison operators == and ===.

If you are allowed to use library functions then this problem looks like a good fit for the JavaScript String.replace(regex,str) function.

answered Sep 23 '11 at 13:53

maerics

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hey now. it's clearly an entry level assignment in an entry level class. If he pulls out regex the teacher will be a bit fishy. :p – Cory Danielson Sep 23 '11 at 13:55
@ImportedNoob: true, but I'll bet if you search the internet for "JavaScript string replace" (derived simply from the goal of the homework) you could get yourself to the same place... – maerics Sep 23 '11 at 13:57

score 1 · Answer 3 · edited May 23 '17 at 11:47

1

Try this:

str.replace(/(\s)/g, "spaces")

Or take a look at this previous answer to a similar question: Fastest method to replace all instances of a character in a string

Hope this help

edited May 23 '17 at 11:47

Community

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1

answered Sep 23 '11 at 13:54

Simon Arnold

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That will only replace the first instance of the space character. – Colin Sep 23 '11 at 13:57
That will only replace the first space. – yoozer8 Sep 23 '11 at 13:57

score 1 · Answer 4 · answered Sep 23 '11 at 13:55

1

Another option would be to skip the for cycle altogether and use a regular expression:

"Visit Micro soft!".replace(/(\s)/g, '');

answered Sep 23 '11 at 13:55

Saul

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score 0 · Answer 5 · answered Sep 23 '11 at 13:54

You should use the string replace method. Inconvenienty, there is no replaceAll, but you can replace all anyways using a loop.

Example of replace:

var word = "Hello"
word = word.replace('e', 'r')
alert(word) //word = "Hrllo"

The second tool that will be useful to you is indexOf, which tells you where a string occurs in a string. It returns -1 if the string does not appear.

Example:

var sentence = "StackOverflow is helpful"
alert(sentence.indexOf(' ')) //alerts 13
alert(sentence.indexOf('z')) //alerts -1

javascript - replacing spaces with a string

5 Answers5