let a = [{name:"", age:"", sex:""}, {name:"", age:"", sex:""}, {name:"", age:"", sex:""}];
let b = [{name:"", age:"", sex:"}, {name:"", age:"", sex:""}, {name:"", age:"", sex:""}];
what method is used to merge two arrays? Get c = [{name:"", age:"", sex:""}, {name:", age:"", sex:""}];