javascript - Function to turn an array of objects into an array of primitives, by key -

i need js function able turn :

[     {         prop1: 'val1',         prop2: 'val2'     },     {         prop1: 'val3',         prop2: 'val4'     },     {         prop1: 'val5',         prop2: 'val6'     } ] 

into :

['val1', 'val3', 'val5'] // took each object's .prop1 

as may have noticed question's title, i'm not sure of right way word (english not native language).

as consequence, kinda hard find googling, wrote own ; have feeling there's native js function job. there ?

(for record, here's wrote :)

function dosomethingbykey(objarr, key) {     var result = [];      (i in objarr) {         if (objarr[i].hasownproperty(key)) {             result.push(objarr[i][key]);         }     }      return result; } 

iterating on array of objects , getting 1 key of each object typically called "plucking", though there other names. in modern javascript versions can trivially implemented map:

var arr  = [{ foo : 'bar', baz : 42 }, { foo : ... }, ...],     foos = arr.map(function (obj) { return obj.foo; }); 

if want abstract function:

function pluck(arr, key) {     return arr.map(function (obj) { return obj[key]; }); }  pluck(arr, 'foo'); 

if hasownproperty concern, function optimal gets already.