javascript convert array to string

Question

Hello i have 2 arrays and and i want to put them in a single string. My arrays can take values from 0 to a maxNum-1. So lets say i have myArray1[i] and myArray2[i] I want to make a string like this:

string = "myArray1ID" + 1 + "=" + (myArray1[1])
    + "&" +"myArray2ID" + 1 + "=" + (myArray2[1])
    + "&" + "myArray1ID" + 2 + "=" + (myArray1[2])
    + "&" + "myArray2ID" + 2 + "=" + (myArray2[2])
    + ......
    + "myArray1ID" + (maxNum - 1) + "=" + (myArray[maxNum-1])
    + "&" "myArray2ID" + (maxNum - 1) + "=" + (myArray2[maxNum-1]);

Is it possible?

Do you have myarray[0] and my2ndarray[0]? E.g. Are there duplicate keys? — Scott Stevens
– Scott Stevens, Commented Jun 8, 2012 at 7:51
yes it is, you just did :) why cant you just loop those arrays? — meo
– meo, Commented Jun 8, 2012 at 7:51

nickf · Accepted Answer · 2012-06-08 07:54:34Z

3

Use the power of loops.

var output = [];

for (var i = 1; i < maxNum; ++i) {
    output.push(
        'myArray1ID' + i + '=' + myArray1[i],
        'myArray2ID' + i + '=' + myArray2[i]
    );
}
return output.join('&');

answered Jun 8, 2012 at 7:54

nickf

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Comments

Steve · Accepted Answer · 2012-06-08 08:30:27Z

1

var myString = '';

for(var i; i < myArray1.length; i++){
  myString += "myArray1ID" + i + "=" + (myArray1[i]) + "&";
  myString += "myArray2ID" + i + "=" + (myArray2[i]) + "&";
}

//remove trialing "&"
var myString = myString.substring(0, myString.length-1);

This assumes that both arrays are of equal length

edited Jun 8, 2012 at 8:30

answered Jun 8, 2012 at 7:55

Steve

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Comments

jbrtrnd · Accepted Answer · 2012-06-08 07:54:49Z

0

Use a loop :

var stringArray = sep = ""; 
for(var i = 1; i < maxNum; i++) {
    stringArray += sep + "myArray1ID" + i + "=" + myArray1[i];
    stringArray += "&myArray2ID" + i + "=" + myArray2[i];
    sep = "&";
}

The var stringArray should contains your array values.

answered Jun 8, 2012 at 7:54

jbrtrnd

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1 Comment

Scott Over a year ago

In this example, the variable 'sep' will be leaked to the global scope. Unless that's your intention, the two variables 'stringArray' and 'sep' should be defined individually. Also, nickf's answer will be more performant, array operations are generally faster than string concatenation.

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