Say that I have an object with key/value pair as the following:
var someVar = {
color: "white",
font_size: "30px",
font_weight: "normal"
...some more variables and functions
};
Is there a way to do a multiple assignment to those keys instead of having to do something like this:
someVar.color = "blue";
someVar.font_size = "30px";
...
With ES2015 you can use Object.assign:
const someVar = {
color: "white",
font_size: "30px",
font_weight: "normal"
};
const newVar = Object.assign({}, someVar, {
color: "blue",
font_size: "30px"});
console.log(newVar);
=>
{
color: "blue",
font_size: "30px",
font_weight: "normal"
}
With ES6 Spread Operator:
someVar = {...someVar, color: "blue", font_size: "30px"}
You could loop through another object:
var thingsToAdd = {
color: "blue",
font_size: "30px"
};
for (var x in thingsToAdd) someVar[x] = thingsToAdd[x];
Or, you could use with (WARNING: this is ALMOST CERTAINLY a bad idea! See the link. I am only posting this for educational purposes; you should almost never use with in production code!):
with (someVar) {
color = "blue";
font_size = "30px";
}
I would use Object Constructors. Would look something like this:
function someVar (color,fontSize, fontWeight){
this.color = color,
this.fontSize = fontSize,
this.fontWeight = fontWeight
};
var var1 = new someVar("red","12px","45px");
var myvar ={};
myvar['color']='red';
myvar['width'] ='100px';
alert(myvar.color);
or alert(myvar['color']);
var col = 'color'; myvar[col] = 'red';