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Strange javascript toString() behaviour


By : Nad Edap
Date : September 15 2020, 02:00 PM
I wish did fix the issue. The toString method you put on the State is bound to the original instance of the state:
code :
class State { 
  constructor(xs) { this.xs = xs } 
  toString = () => `[${this.xs}]` // Class field arrow function
}
const obj = {
  val: 'val',
  toString: () => obj.val
};

const copiedObj = { ...obj, val: 'newVal' };
console.log(copiedObj.toString());
toString = function () {
    return `[${this.xs}]`;
}
toString() {
    return `[${this.xs}]`;
}
const reducer = (state, action) => ({
    ...state,
    xs: [...state.xs, action.x]
});


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Strange behaviour with range.toString()


By : DAVID WRA
Date : March 29 2020, 07:55 AM
I wish this helpful for you I want to get back the text that I select in an element using the Range object provided by Mozilla's flavour of javascript. , OK, I used part of the answer from Tim Down in the end:
code :
  var sel = window.getSelection();
  var range = sel.getRangeAt(0);
  var range2 = range.cloneRange();

  //do some stuff with range2...

  var rangeText, range2Text;

  sel.removeAllRanges();
  sel.addRange(range);
  rangeText = sel.toString();

  sel.removeAllRanges();
  sel.addRange(range2);
  range2Text = sel.toString();

Javascript strange behaviour


By : user3146194
Date : March 29 2020, 07:55 AM
may help you . Can anyone explain this code to me , constructor is a property of the prototype object:
code :
var ChildClass = function(){
}

alert(ChildClass.prototype.constructor == ChildClass); // alert true
  +-------------------+           +--------------------+
  |                   |           |                    |
  |ChildClass instance|---------->|ChildClass protoype |
  |                   |           |  constructor prop  |
  +-------------------+           +--------------------+
ParentClass.prototype.constructor
  +-------------------+      +--------------------+      +---------------------+
  |                   |      |                    |      |                     |
  |ChildClass instance| ---> |ParentClass instance| ---> |ParentClass prototype|
  |                   |      |                    |      |   constructor  prop |
  +-------------------+      +--------------------+      +---------------------+

Javascript toString() strange behavior


By : yledroug
Date : March 29 2020, 07:55 AM
Does that help It's not JavaScript only, virtually every language manipulating floating point value have this issue.
To avoid it, you can use Math.round() or .toFixed().
code :
Math.round(123.456);
// returns 123

123.4.toFixed(2);
// returns "123.40"

Javascript map strange behaviour


By : user9379292
Date : March 29 2020, 07:55 AM
will be helpful for those in need The function provided as the callback to Array.prototype.map receives three arguments:
the element from the array the index in the array the array itself
code :
string | base | result
----------------------
1      | 0    | 1
0      | 1    | NaN
2      | 2    | NaN
9      | 3    | NaN
0      | 4    | 0
4      | 5    | 4

Strange Javascript behaviour


By : Guang Pan
Date : March 29 2020, 07:55 AM
around this issue Try onclick="highlight.call(this);"
However, it would be much cleaner to properly attach an event handler:
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