I need to add in a For Loop characters to an empty string. I know that you can use the function concat in Javascript to do concats with strings
var first_name = "peter";
var last_name = "jones";
var name=first_name.concat(last_name)
But it doesn't work with my example. Any idea of how to do it in another way?
My code :
var text ="";
for (var member in list) {
text.concat(list[member]);
}
let text = "";
for(let member in list) {
text += list[member];
}
for...in), and join on those: var text = ""; text += Object.keys(list).join('')You can also keep adding strings to an existing string like so:
var myString = "Hello ";
myString += "World";
myString += "!";
the result would be -> Hello World!
simply used the + operator. Javascript concats strings with +
It sounds like you want to use join, e.g.:
var text = list.join();
for...in to traverse an array, so your suggestion probably works.To use String.concat, you need to replace your existing text, since the function does not act by reference.
let text = "";
for (const member in list) {
text = text.concat(list[member]);
}
Of course, the join() or += suggestions offered by others will work fine as well.
Simple use text = text + string2
Try this. It adds the same char multiple times to a string
const addCharsToString = (string, char, howManyTimes) => {
string + new Array(howManyTimes).fill(char).join('')
}
You can also use string interpolation
let text = "";
for(let member in list) {
text = `${text}${list[member]}`;
}
your array of strings (list) could work with map and join; (Also possible to additionally change strings if you want)
var text = list.map(i => `${i}`).join(' ')
would return First Name
but if you want to add more things around the name, above template also helps:
var text = list.map(i => `'${i}'`).join(' ')
would return 'First' 'Name'
and in case you would want to have a sequence of names, separeted by comma
var text = list.map(i => `'${i}'`).join(',')
would return 'First','Name','Second','Third',...
for...inbut a normalforloop. More information here: developer.mozilla.org/en/JavaScript/Reference/Statements/… Btw. if you look closely at both of your examples, you can see the difference (name=first_name.concat(last_name)vstext.concat(list[member])