Can someone help me find a polyfill for the object spread operator in javascript? I'm looking for either a cdn link or a method to achieve this using es5 javascript.
var x = {
example: 456,
sample: 789
}
var y = {
...x,
result: 321
}
Can someone help me find a polyfill for the object spread operator in javascript? I'm looking for either a cdn link or a method to achieve this using es5 javascript.
var x = {
example: 456,
sample: 789
}
var y = {
...x,
result: 321
}
No, it is not possible to polyfill object spread since it is a syntax feature and not an object or method that can be polyfilled. However, you can transpile the code using Babel: http://babeljs.io/
"use strict";
function _objectSpread(target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i] != null ? arguments[i] : {};
var ownKeys = Object.keys(source);
if (typeof Object.getOwnPropertySymbols === "function") {
ownKeys = ownKeys.concat(
Object.getOwnPropertySymbols(source).filter(function(sym) {
return Object.getOwnPropertyDescriptor(source, sym).enumerable;
})
);
}
ownKeys.forEach(function(key) {
_defineProperty(target, key, source[key]);
});
}
return target;
}
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
} else {
obj[key] = value;
}
return obj;
}
var i = {
test: 123,
test1: 5234
};
var b = _objectSpread({}, i, {
test3: 243
});
Although it may look ugly, this approach will work and can be done automatically.
In the case of needing a polyfill for Object.assign, you can do so by including the following script:
var b = Object.assign({}, i, { test3: 243 });
Before, the spread/rest operator was considered invalid syntax. To apply it, you must convert the syntax into a valid form.
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