I want to add some number to elements of any array but I get NaN. I know why we have all NaN. Just want to know a way to do something similar.
var a = [];
for(var i=0;i<6;i++){
for(var j=0;j<2;j++){
var random_number = Math.floor(Math.random() * 10) + 1;
a[i] += random_number
}
}
console.log(a) //[NaN, NaN, NaN, NaN, NaN, NaN]+= ... is appending ... to whatever was previously in your variable. Here, it's appending a number to an unset value, giving NaN.
Just get rid of your += when setting your array values :
var a = [];
for(var i=0;i<6;i++){
for(var j=0;j<2;j++){
var random_number = Math.floor(Math.random() * 10) + 1;
a[i] = random_number;
}
}
console.log(a)You could take a default value of zero instead of undefined for addition.
var a = [],
i, j, random_number;
for (i = 0; i < 6; i++) {
for (j = 0; j < 2; j++) {
random_number = Math.floor(Math.random() * 10) + 1;
a[i] = (a[i] || 0) + random_number;
}
}
console.log(a)
Just remove '+=' , instead just use '='
You are assigning a number to an unassigned variable. That's why you are getting NaN error.
