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how to separate a string by comma in javascript? [duplicate]

This question already has answers here:
How do I split a string into an array of characters? [duplicate]
(8 answers)
How to get character array from a string?
(14 answers)
Closed 1 year ago.
how to print as follows in javascript ?
if my input is "smart"
then my output could be "s,m,a,r,t"
I've tried by using this logic but i got the output as
s,m,a,r,t,
let a = " ";
str = userInput[0];
console.log(str);
for (let i = 0; i < str.length; i++) {
a = a + str[i] + ",";
}
console.log(a.trim());

You can use the split method in js
var str = "smart";
var res = str.split("").join();
console.log(res)
//if you want it to remain an array don't do the join

Print all the names of keys stored in localStorage html [duplicate]

This question already has answers here:
Get HTML5 localStorage keys
(15 answers)
Closed 7 years ago.
I'm trying to print the names of all the keys stored in localStorage with each key in a separate line. This is my code:
function viewsaved(){
$('#saved').show();
var stuffsaved = Object.keys(localStorage);
var splitit = stuffsaved.split(',');
for (var i = 0 ; i < splitit.length ; i++ ){
$('#saved').append(splitit[i]+"<br>");
}
}
when I call the function, it does nothing.
How do you do this properly?

Object.keys returns an array, not a string. Just modify slightly:
var stuffsaved = Object.keys(localStorage);
for (var i = 0 ; i < stuffsaved.length ; i++ ) {
$('#saved').append(stuffsaved[i]+"<br>");
}
If you have or expect a lot of keys, I would suggest building the list in a temporary variable first to avoid frequent DOM update, for example:
var keys = Object.keys(localStorage);
var list = "";
for (var i = 0 ; i < keys.length ; i++ ) {
list += keys[i] + "<br>";
}
$('#saved').append(list);

Why this replace doesn't work Javascript? [duplicate]

This question already has answers here:
Replace method doesn't work
(4 answers)
Closed 7 years ago.
I want to know why this procedure doesn't replace words
I have to do a procedure which reads a string and replace all word like this {{employee.Name}} into a value on the ticket's scope
var mySplitResult = Val.split(' ');
for (var i = 0; i < mySplitResult.length; i++) {
if (mySplitResult[i].match("{{") && mySplitResult[i].match(".")) {
var start = mySplitResult[i].lastIndexOf(".") + 1;
var end = mySplitResult[i].indexOf("}}");
var result = mySplitResult[i].substring(start, end);
for (var key in ticket.PNData) {
if (key == result) {
change.replace(mySplitResult[i], ticket.PNData[key]);
alert(change)
}
}
}
}

In JavaScript strings are immutable which means you must assign the result to a variable.
mySplitResult[i] = mychange.replace(mySplitResult[i], ticket.PNData[key]);

Alternative to eval [duplicate]

This question already has answers here:
Alternative to eval() javascript [duplicate]
(6 answers)
Closed 9 years ago.
I am making some common function where in I pass the array, name of field from array, value of field in array and return field name to return value as below
function arrayFilter(_array, findField, value, returnField) {
var temp = "_array[i]." + findField;
var retValue = "";
for (var i = 0; i < _array.length; i++) {
if (eval(temp) == value) {
return eval("_array[i]." + returnField);
}
}
}
But when I read on Internet I found that eval is not good, it can have string injection attack.
So somebody help on above.

Instead of:
return eval("_array[i]." + returnField);
Try:
return _array[i][returnField];
And also read this article.

You can use the square bracket notation for accessing properties when the value of your key is unknown.
function arrayFilter(_array, findField, value, returnField) {
var temp = _array[i][findField];
var retValue = "";
for (var i = 0; i < _array.length; i++) {
if (temp == value) {
return _array[i][returnField];
}
}
}

Convert string of variables separated by & into array [duplicate]

This question already has answers here:
How can I get query string values in JavaScript?
(73 answers)
Closed 9 years ago.
I want to grab the variables contained in the url after somebody logs into my Facebook app.
For example:
// window.location = .../#access_token=CTTG4fT3ci...&expires_in=5298
hash = window.location.hash;
data = PARSE(hash);
console.log(data['access_token'] + ', ' + data['expires_in']);
// returns: CAAG4fT3ci..., 5298
Is there a method or function similar to JSON.parse() that would convert "hash" into an array or object?

function PARSE (hash) {
var l, chunk, i = 0, out = {};
var chunks = hash.substr(1).split('&');
for ( l = chunks.length; i < l; i++ ) {
chunk = chunks[i].split('=');
out[ chunk[0] ] = chunk[1];
}
return out;
}
Here's the fiddle: http://jsfiddle.net/VwLJS/