immutableCloining

immutableCloining.ts

// Array.from()

const addition1 = (param) => {
console.log(param)      //    []                            

const copiedParam = Array.from(param)

console.log('param', param, 'copiedParam', copiedParam)     //    param [] copiedParam []

param.push(11111)
copiedParam.push(22222)
console.log('param', param, 'copiedParam', copiedParam)      //      param [11111] copiedParam [22222]

return {param: param, copiedParam:copiedParam}      // {param: [11111], copiedParam: [22222]}

}

const a = []
addition1(a)


// splice()

const addition2 = (param) => {
console.log(param)      //    []                            

const copiedParam = param.slice()

console.log('param', param, 'copiedParam', copiedParam)     //    param [] copiedParam []

param.push(11111)
copiedParam.push(22222)
console.log('param', param, 'copiedParam', copiedParam)      //      param [11111] copiedParam [22222]

return {param: param, copiedParam:copiedParam}      // {param: [11111], copiedParam: [22222]}

}

const b = []
addition1(b)

https://www.samanthaming.com/tidbits/35-es6-way-to-clone-an-array/