Searching high and low, but no luck finding the answer...just bits and pieces of it. I came across an interview question that has me stumped... Given an array with a length of 9, and 10 numbers ranging from 1 to 10. These numbers are randomly placed into the array. How can you determine which number was left out and did not make it into the array? Any ideas?
Here is a code snippet for generating random numbers:
let nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let picked = [];
for(let i = 0; i < 9; i++){
let idx = Math.floor((Math.random() * nums.length));
picked.push(nums[idx]);
nums.splice(idx, 1);
}
document.write(JSON.stringify(picked) + "<br>");
document.write(nums);To utilize the array.indexOf() method, follow these steps:
Create a random array called arr. Then, implement the following code:
for(var i=1;i<=10;i++){
if(arr.indexOf(i)==-1){
console.log(i+'is not in the array');
return i;
}
}
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