Please Explain code

@najmulJun 08.2014

I am new in JavaScript and I cannot understand some code given below .Can anyone explain Line 3 and Line 4 ?

var text = prompt(“What is this ?”);
var firstChar = text.indexOf(“World War II”);
if (firstChar !== -1) {
text = text.slice(0, firstChar) + “the Second World War” + text.slice(firstChar + 12);
}
alert (text);

to post a comment

JavaScript

@xelawhoJun 08.2014 — #it's not worth explaining because it makes no sense. What are you trying to do?

@rootJun 08.2014 — #Sorry, my brain just imploded, can't make sense of it either.

@najmulauthorJun 09.2014 — #If you cannot help then stay out of my post .Better stay away from forum .

it's not worth explaining because it makes no sense. What are you trying to do?[/QUOTE]

@najmulauthorJun 09.2014 — #I thought, I would find help here..Here Everyone is too advanced , no place for beginners.
Sorry, my brain just imploded, can't make sense of it either.[/QUOTE]

@deathshadowJun 09.2014 — #first line asks a question putting whatever is typed in into the 'text' variable.

the next line finds the first instance of "World War II" in that 'text' and puts that into the 'firstChar' variable. The 'indexOf' function will return -1 if there is no match.

The 'IF' statement checks if it's not -1, in which case there was a match.

... so it then uses 'slice' to take all text before the match, plug in "the Second World War", then all text after the match.

Next we close the if statement with }

Then we alert the result.

Which is a VERY complex way of simply going:

var text = prompt("What is this ?").replace(
 'World War II', 'the Second World War'
 );
 alert (text);

Though a more complex regex would probably be in order.

Please Explain code

5 Comments(s) _↴

Also in #JavaScript _↴

Success!

Social

Version

Please Explain code

5 Comments(s) ↴

Also in #JavaScript ↴

Success!

The web is an endless sea of information. Don't miss the boat... Subscribe!

Social

Version

5 Comments(s) _↴

Also in #JavaScript _↴