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reduce method in JavaScript is used to reduce the array to a single value.
It takes a callback function which takes four parameters (accumulator, currentValue, index, array), but mostly we use the first two.
Examples
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𝟏. 𝐂𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐞 𝐬𝐮𝐦 𝐨𝐟 𝐚𝐥𝐥 𝐭𝐡𝐞 𝐞𝐥𝐞𝐦𝐞𝐧𝐭𝐬 𝐢𝐧 𝐚𝐧 𝐚𝐫𝐫𝐚𝐲
𝟐. 𝐂𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐞 𝐭𝐨𝐭𝐚𝐥 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐟𝐫𝐮𝐢𝐭𝐬 𝐢𝐧 𝐭𝐡𝐞 𝐚𝐫𝐫𝐚𝐲
𝟑. 𝐆𝐫𝐨𝐮𝐩 𝐬𝐭𝐮𝐝𝐞𝐧𝐭𝐬 𝐛𝐲 𝐜𝐥𝐚𝐬𝐬𝐧𝐚𝐦𝐞