I would like to "push" a variable into a subarray which contains a value. This is to integrate into a "for loop". But it does not work ..:-( where is my mistake ? Thanks.
var add = "purple";
var val = "white";
arr = [
["blue","green","brown"],
["white","gray","black"],
["yellow","pink","red"]
];
subarr = [].indexOf(val) > -1;
arr[subarr].push(add);
/*
expected output :
arr = [
["blue","green","brown"],
["white","gray","black","purple"],
["yellow","pink","red"]
]
*/
You are looking
subarr = [].indexOf(val) > -1;
into an empty array.
Instead, you could find the sub array and if exists push the value to it.
const
add = "purple";
val = "white",
arr = [["blue", "green", "brown"], ["white", "gray", "black"], ["yellow", "pink", "red"]],
sub = arr.find(a => a.includes(val));
if (sub) sub.push(add);
console.log(arr);.as-console-wrapper { max-height: 100% !important; top: 0; }