When I do the below, I get an empty string for some reason.
var jsObj2 = {
"key1": "value3",
"key4": "value4"
};
var c = '';
for (var key in jsObj2) {
c.concat(key + ': ' + jsObj2[key]);
}
console.log(c);
What I would have hoped for where
key1: value3
key4: value4
Can anyone explain why my attempt doesn't work, and how the NodeJS approach would be?
The string c is not modified in place, but returns a new string.
Use c = c.concat(key + ': ' + jsObj2[key]);
You have to assign concated value to a variable.
var jsObj2 = {
"key1": "value3",
"key4": "value4"
};
var c = '';
for (var key in jsObj2) {
c = c.concat(key + ': ' + jsObj2[key]);
}
console.log(c);prefer to use += operator
var jsObj2 = { key1: "value3"
, key4: "value4"
}
, c = ''
, comma = ''
;
for (var key in jsObj2)
{
c += comma + key + ': ' + jsObj2[key]
comma = ', '
}
console.log(c)or :
var jsObj2 = { key1: "value3"
, key4: "value4"
}
, c = Object.entries(jsObj2)
.map(([k,v])=>`${k}: ${v}`)
.join(', ')
;
console.log(c)One more way to do it:
const jsObj2 = {"key1": "value3", "key4": "value4"};
let str = Object.entries(jsObj2).join('').replace(/,/g, ': ');
console.log(str);