var arr=[{a:1,b:2},{a:2,b:3}]
var arr1 = [{c:1,d:2},{c:3,d:4}]
arr2=[{a:1,b:2,c:1,d:2},{a:2,b:3,c:3,d:4}]
var arr=[{a:1,b:2},{a:2,b:3}]
var arr1 = [{c:1,d:2},{c:3,d:4}]
arr2=[{a:1,b:2,c:1,d:2},{a:2,b:3,c:3,d:4}]arr.forEach((k,i) => {
Object.assign(k,arr1[i]);
})is arr2,arr1 invariant
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