INTERVIEW QUESTIONS WEB JAVA SCRIPT DETAILS

Question: How do I ...
with JavaScript/JScript
... use the same variable name several times in a script?

Answer: By default all variables in JavaScript are global, meaning they retain their values everywhere in a scripted web page. To make a variable local to a block (such as a function), declare it with the keyword var. Here's a n example:

// here 'i' is a global counter variable that could, if reused
// elsewhere in this script, create hard-to-find errors

for( i=1; i<=N; i++ ) {
[code to iterate]
}

// to ensure that 'i' exists only in the scope of this
// counter, use var:

for( var i=1; i<=N; i++ ) {
[ ... ]
}

By default all variables in JavaScript are global, meaning they retain their values everywhere in a scripted web page. To make a variable local to a block (such as a function), declare it with the keyword var. Here's a n example:

// here 'i' is a global counter variable that could, if reused
// elsewhere in this script, create hard-to-find errors

for( i=1; i<=N; i++ ) {
[code to iterate]
}

// to ensure that 'i' exists only in the scope of this
// counter, use var:

for( var i=1; i<=N; i++ ) {
[ ... ]
}
Source: CoolInterview.com

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