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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))

REMOVE SPECIFIC NUMBER WITH JS [closed]

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I'M TRYING TO HANDLE THIS DATA IN JAVASCRIPT SO HOW CAN I REMOVE DATA ACCORDING TO THE ID NUMBER THE FIRST NUMBER
600030/01/2018/163904
600010/01/2014/3789
600030/01/2020/47104
600030/01/2012/39104
600010/01/2011/93817
how can i remove all 600030 data so i get
600010/01/2014/3789
600010/01/2011/93817

If all data shaped in Array and element is instance of String.
I would recommend Array.prototype.filter and String.prototype.startsWith();
let data = [
'600030/01/2018/163904',
'600010/01/2014/3789',
'600030/01/2020/47104',
'600030/01/2012/39104',
'600010/01/2011/93817',
];
let filteredData = data.filter((d)=>!d.startsWith('600030'));
console.log( filteredData );
Result is
[
'600010/01/2014/3789',
'600010/01/2011/93817'
]

Split arrays into multiple arrays based on string characters [closed]

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My Initial array:
var mainArray = ['car','incl','arc','linc','rca','icnl','meta','tame'];
I want the result like:
[['car','arc','rca'],['linc','icnl','incl'],['meta','tame']];

This is a compact version by using a closure for the sorted character array.
var array = ['car', 'incl', 'arc', 'linc', 'rca', 'icnl', 'meta', 'tame'],
result = Object.values(
array.reduce(
(r, s) => (a => ((r[a] = r[a] || []).push(s), r))([...s].sort()),
{}
)
);
console.log(result);

how to copy previous value in array (string) [closed]

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So how we can make a function that will take arrays of string like const numbers = ['1','2','0','3','0']
and change it for const changedNumbers = ['1','1','2','2','0','3','3','0']

Iterate with Array.map(). If '0' return '0', else return an array with two current string. Flatten by spreading into Array.concat():
const numbers = ['1','2','0','3','0']
const result = [].concat(...numbers.map((s) => +s ? [s, s] : s));
console.log(result);

Output array in javascript [closed]

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When I console.log(arrayname) I get this:
How do I Output the value "test"?

Just take the index of the array.
var arrayname = ['test'];
console.log(arrayname[0]);
// ^^^

var foo = Array('bar', 'baz', 'qux');
alert(foo[0]); //First item
alert(foo[1]); //Second item
alert(foo[2]); //Third item