Masih di javascript tutorial, kali ini rumah code akan membahas tentang bagaimana caranya untuk menconvert string ke integer dengan menggunakan javascript atau biasa kita sebut convert string to int javascript. kentapa saya tutorial tentang convert string to integer javascript? karena saya menemukan sebuah kasus yang mengambil variabel dari value dari sebuah Html input element dan ingin menjumlahkan nya namun yang saya dapatkan bukan penjumlahan tapi malah menggabungkan nilai dari kedua input element tersebut.
Contoh script di atas merupakan kasus yang saya temukan misalkan nilai dari Input elemet a adalah 1 dan nilai dari input element b adalah 2 hasil yang saya dapatkan keitak menambakan dengan menggunakan perintah var c = a + b; akan menjadi 12. Di situ saya menyadari bahwa nilai yang saya dapatkan dari input elemet merupakan sebuah string. Untuk melakukan operasi penjumlahan berarti kita harus mengkonversi string menjadi sebuah integer. String to int pada javascript / String to integer javascriptBagaimana cara mengkonversi string menjadi integer pada java script? Caranya sebenar nya tidak lah sulit karena javascript sudah menyediakan fungsi untuk mengkonversi nya yaiut dengan menggunakan fungsi parseInt.
dengan menggunakan perintah di atas kita dapat melakukan konversi string ke integer javascript dengan mudah. Sekarang saya akan menggunakan fungsi parseInt pada contoh source kode
dengan merubah
menjadi
kita akan mendapatkan penjumlahan fungsi aritmatika jadi ketika kita melakukan penjumlahan 1 + 2 kita akan mendapatkan hasil 3 bukan 12. Pada tutorial kali ini kita akan mencoba konversi string menjadi array menggunakan methode The 2 static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.
3The value to convert to a JSON string. 4 OptionalA function that alters the behavior of the stringification process, or an array of strings and numbers that specifies properties of 3 to be included in the output. If 4 is an array, all elements in this array that are not strings or numbers (either primitives or wrapper objects), including 7 values, are completely ignored. If 4 is anything other than a function or an array (e.g. 9 or not provided), all string-keyed properties of the object are included in the resulting JSON string. 0 OptionalA string or number that's used to insert white space (including indentation, line break characters, etc.) into the output JSON string for readability purposes. If this is a number, it indicates the number of space characters to be used as indentation, clamped to 10 (that is, any number greater than 1 is treated as if it were 1). Values less than 1 indicate that no space should be used.If this is a string, the string (or the first 10 characters of the string, if it's longer than that) is inserted before every nested object or array. If 0 is anything other than a string or number (can be either a primitive or a wrapper object) — for example, is 9 or not provided — no white space is used.A JSON string representing the given value, or undefined. 5Thrown if one of the following is true:
2 converts a value to the JSON notation that the value represents. Values are stringified in the following manner:
The 4 parameter can be either a function or an array.As an array, its elements indicate the names of the properties in the object that should be included in the resulting JSON string. Only string and number values are taken into account; symbol keys are ignored. As a function, it takes two parameters: the 8 and the 3 being stringified. The object in which the key was found is provided as the 4's 6 context.The 4 function is called for the initial object being stringified as well, in which case the 8 is an empty string ( 9). It is then called for each property on the object or array being stringified. Array indices will be provided in its string form as 8. The current property value will be replaced with the 4's return value for stringification. This means:
Note: When parsing JSON generated with 4 functions, you would likely want to use the parameter to perform the reverse operation.Typically, array elements' index would never shift (even when the element is an invalid value like a function, it will become 9 instead of omitted). Using the 4 function allows you to control the order of the array elements by returning a different array.The 0 parameter may be used to control spacing in the final string.
Each level of indentation will never be longer than 10. Number values of 0 are clamped to 10, and string values are truncated to 10 characters.
If you wish the 4 to distinguish an initial object from a key with an empty string property (since both would give the empty string as key and potentially an object as value), you will have to keep track of the iteration count (if it is beyond the first iteration, it is a genuine empty string key).
Indent the output with one space:
Using a tab character mimics standard pretty-print appearance:
Defining 7 for an object allows overriding its serialization behavior.
Since the JSON format doesn't support object references (although an IETF draft exists), a 5 will be thrown if one attempts to encode an object with circular references.
To serialize circular references, you can use a library that supports them (e.g. cycle.js by Douglas Crockford) or implement a solution yourself, which will require finding and replacing (or removing) the cyclic references by serializable values. If you are using 2 to deep-copy an object, you may instead want to use 7, which supports circular references. JavaScript engine APIs for binary serialization, such as , also support circular references.In a case where you want to store an object created by your user and allow it to be restored even after the browser has been closed, the following example is a model for the applicability of 2:
Engines implementing the well-formed JSON.stringify specification will stringify lone surrogates (any code point from U+D800 to U+DFFF) using Unicode escape sequences rather than literally (outputting lone surrogates). Before this change, such strings could not be encoded in valid UTF-8 or UTF-16: 0But with this change 2 represents lone surrogates using JSON escape sequences that can be encoded in valid UTF-8 or UTF-16: 1This change should be backwards-compatible as long as you pass the result of 2 to APIs such as 02 that will accept any valid JSON text, because they will treat Unicode escapes of lone surrogates as identical to the lone surrogates themselves. Only if you are directly interpreting the result of 2 do you need to carefully handle 2's two possible encodings of these code points. |