Simple JavaScript
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n/**\n * @param {number[]} nums\n * @return {number}\n */\nvar findTheArrayConcVal = function(nums) {\n    let sum = 0;\n\n    while(nums.length) {\n        const first = nums.shift();\n        const last = nums.pop();\n        const concat = first?.toString() + last?.toString();\n        sum += parseInt(concat);\n    }\n\n    return sum;\n};\n```
['JavaScript']