javascript object append object
you define element to be a plain object. The native JavaScript object has no push() method. To add new items to a plain object use this syntax: element[ yourKey ] = yourValue;. On the other hand you could define element as an array using var element = [], How about storing the alerts as records in an array instead of properties of a single object ? var alerts = [ num : 1, app:'helloworld',message:'message'}, num : 2, app:'helloagain',message:'another message'} ]. And then t, I think you are mixing up objects and arrays. Objects have named keys, arrays have numeric keys. You can easily append to an array using .push() : var arr = []; arr.push("something");. However, for a configuration object as your variable name s, It's also a good practice to freeze the object as well as the new array in order to avoid unintended mutations. A frozen object is neither mutable nor extensible (shallowly). Applying those points and to answer your two questions, you could define a , ES6 - this will mutate objectToMergeTo const combinedObject = Object.assign(objectToMergeTo, source1, source2). ES7 (syntax beauty with spread operator) - this version however creates a new instance, you can't add into an object with spread operator., You can use this equivalent syntax: obj[name] = value., Object.assign() 事件只會從來源物件將自身可列舉的屬性複製到目標物件。該事件使用來源物件的 [[Get]] 事件和目標物件的 [[Set]] 事件，使它將會執行getters和setters。因此，這邊的指派(assigns)屬性不只是複製或定義新屬性。若在合併包含getters的來源物件時，這個事件可能就不適合用來合併屬性。至於複製屬性 ...
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 javascript object append object 相關參考資料
javascript - Adding elements to object - Stack Overflow
you define element to be a plain object. The native JavaScript object has no push() method. To add new items to a plain object use this syntax: element[ yourKey ] = yourValue;. On the other hand you ... https://stackoverflow.com javascript - Appending to an object - Stack Overflow
How about storing the alerts as records in an array instead of properties of a single object ? var alerts = [ num : 1, app:'helloworld',message:'message'}, num : 2, app:'helloagai... https://stackoverflow.com How can I add javascript object to another object in dynamic ...
I think you are mixing up objects and arrays. Objects have named keys, arrays have numeric keys. You can easily append to an array using .push() : var arr = []; arr.push("something");. Howe... https://stackoverflow.com javascript - How to add an object to an array - Stack Overflow
It's also a good practice to freeze the object as well as the new array in order to avoid unintended mutations. A frozen object is neither mutable nor extensible (shallowly). Applying those point... https://stackoverflow.com Add Javascript Object into another Javascript Object - Stack Overflow
ES6 - this will mutate objectToMergeTo const combinedObject = Object.assign(objectToMergeTo, source1, source2). ES7 (syntax beauty with spread operator) - this version however creates a new instance,... https://stackoverflow.com syntax - Add a property to a JavaScript object using a variable as ...
You can use this equivalent syntax: obj[name] = value. https://stackoverflow.com Object.assign() - JavaScript - MDN - Mozilla
Object.assign() 事件只會從來源物件將自身可列舉的屬性複製到目標物件。該事件使用來源物件的 [[Get]] 事件和目標物件的 [[Set]] 事件，使它將會執行getters和setters。因此，這邊的指派(assigns)屬性不只是複製或定義新屬性。若在合併包含getters的來源物件時，這個事件可能就不適合用來合併屬性。至於複製屬性 ... https://developer.mozilla.org |