One-for solution
Code\n\n/**\n * @param {number[]} nums\n * @return {number}\n */\nvar findTheArrayConcVal = function(nums) {\n    let res = 0;\n    for (let i = 0; i < nums.len
# Code\n```\n/**\n * @param {number[]} nums\n * @return {number}\n */\nvar findTheArrayConcVal = function(nums) {\n    let res = 0;\n    for (let i = 0; i < nums.length / 2; i++) {\n        const rightIndex = nums.length - 1 - i;\n        res += i === rightIndex ? nums[i] : Number(\'\' + nums[i] + nums[rightIndex]);\n    }\n    return res;\n};\n```
['JavaScript']