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Example 1: how to find the index of a value in an array in javascript

var list = ["apple","banana","orange"]

var index_of_apple = list.indexOf("apple") // 0

Example 2: javascript find the min in array of numbers

// Assuming the array is all integers,
// Math.min works as long as you use the spread operator(...).

let arrayOfIntegers = [9, 4, 5, 6, 3];
let min = Math.min(...arrayOfIntegers);
// => 3

Example 3: how to check an array for a value in python

s = set(a)
if 7 in s:
  # do stuff