Formatting String with pattern [closed] - javascript

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I have a String variable who represent date
console.log(goDate); --> "23/12/2014"
how I could turn this variable like this..?:
console.log(goDate); --> "2014-12-23".


var goDate = "23/12/2014"; // needs 2014-12-23
var newGoDate = goDate.split('/').reverse().join('-');

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What does the dollar sign mean in attribute? [closed]

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Today I saw this code:
e = [div] (div is html object)
if (e.empty(), y) {y.$sheet = e;}
How JS define y?
What is y.$sheet?
I tried to y = e.empty(), but it doesn't work (error with defining y.$sheet = e

How to check in javascript if a list contains any element? [closed]

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How to check if a list is not empty?
if (serialNumbersList.Any()) //c# expression equivalent
{
// do stuff
}

In javascript there are no lists but arrays, and you can check their length property
if(serialNumberList.length > 0) {
// Do your stuff
}

How to iterate and append characters of an array by push [closed]

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var charArray=[a,b,c]
I want to have a new array as following:
var charArrayNew=[a, ab, abc]
Please suggest how to get the result of charArrayNew in ES6 Javascript.

You could do this:
const charArray=['a','b','c'];
const answer = charArray.map((_,i,ar)=>ar.slice(0,i+1).join(""));
console.log(answer);
// or, alternatively:
fn=(ar,res=[])=>(
ar.reduce((a,c)=>(res.push(a+=c),a),""),res );
console.log(fn(charArray))

How can i get array key-values pair using javascript [closed]

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for(i=0;i<=array_values.length;i++){
var a=array_values[i].amounts;
var t=array_values[i].Tax;
alert(a);
alert(t);
}
Error : TypeError: array_values[i] is undefined
var a=array_values[i].amounts;
var a=array_values[i].amounts;

change
for(i=0;i<=array_values.length;i++)
to
for(i=0;i<array_values.length;i++)
<= to <

Create an associative array in JavaScript [closed]

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Consider:
var playlist = {"bad romance":"gaga", "we cry":"the script"};
How can I get string "gaga" from my code? What is the name of my array in JavaScript programming?

Try Object instead of Array:
var playlist = {"bad romance":"gaga", "we cry":"the script"};
alert(playlist["bad romance"]); //gaga

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