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A polyfill combinator
github.com/financial-times/polyfill-service
financial-times/polyfill-service
polyfill-service
/
polyfills
/
WeakMap
/
detect.js
7 lines
(6 loc)
•
155 B
JavaScript
View Raw
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(
function
(
global
) {
if
(!(
"WeakMap"
in
global
))
return
false
;
var
o = {};
var
wm =
new
WeakMap
([[o,
'test'
]]);
return
(wm.
get
(o) ===
'test'
); }(
this
))