# db.command.shift
Update command. Deletes the header element from an array when the value of a field is the array.
Function signature:
function shift(values: any[]): Command
Sample code
const cloud = require('wx-server-sdk')
cloud.init()
const db = cloud.database()
const _ = db.command
exports.main = async (event, context) => {
try {
return await db.collection('todos').doc('doc-id').update({
data: {
tags: _.shift()
}
})
} catch(e) {
console.error(e)
}
}