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JavaScript JavaScript Foundations Arrays Methods: Part 3

William Doring
PLUS
William Doring
Courses Plus Student 4,388 Points
Posted by William Doring
William Doring
Courses Plus Student 4,388 Points

I get marked wrong but the correction matches my output.

For the first problem in the following exercise, I changed the line to var saying = first.concat(second +",dog"); this produces the error Bummer! was expecting 'the,quick,brown,...' but got 'the,quick,brown,...' I copied and pasted the strings in the correction into a text editor and they are identical. What am I missing?

1 Answer

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

I think the key is in looking at what is in the original string. If for example in the string it ends with a comma you won't need it in your concatenaton. Would this be what you're looking for?

Hope this helps. :)

William Doring
William Doring
Courses Plus Student 4,388 Points
William Doring
William Doring
Courses Plus Student 4,388 Points

The comma is missing if I concatenated with that syntax so that's not it. There's something with the way the site is testing the syntax, methinks.

I am able to pass with var saying = first.concat(second, "dog");

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

I think you've stumbled on the right answer actually :) The plus (+) operator would be a way to concatenate 2 hancoded strings

so

var concat = "this is a string" + " and this is also " + "a string";

is just as valid concatenation as

first.concat(second, "dog");

The difference being that concat is a built in JavaScript function. :)