promise all constructor

gistfile1.txt

        function createPromises(onFunctions) {
            return onFunctions.map(onFunction => {
                return new Promise((resolve, reject) => {
                    try {
                        onFunction(resolve)
                    } catch (e) {
                        reject(new Error(`Error in function ${onFunction.name}: ${e}`))
                    }
                })
            })
        }
        // Usage:
        const multiPromises = createPromises([onFCP, onLCP])
        Promise.all(multiPromises)
            // , fcp, fid, lcp, inp
            .then(arr => {
                console.log('🚀 ~ .then ~ arr:', arr)
            })
            .catch(error => {
                console.log('🚀 ~ Promise.all ~ error:', error)
                // Handle any error that occurred in the previous steps
            })