String parameter with a variable

Question

String parameter with a variable

I'm currently tackling a challenge with my table constructor in one of my more extensive projects. The issue I am facing is that the variables in the content I am trying to pass on to the constructor function are getting evaluated before they are actually sent. Here's a simplified version of the function that highlights my dilemma:

x = 0;

tableConstructor(["<p>" + x + "</p>", "<div>" + x + "</div>"]);

function tableConstructor (tableContent) {
    for (x = 0; x < 2; x++) {
        window["row" + x] = tableContent[x];

        console.log(window["row" + x]);
    }
}

The current output looks like this:

<p>0</p>
<div>0</div>

However, what I truly desire is this output:

<p>0</p>
<div>1</div>

Any insights or assistance would be greatly appreciated.

javascript function

Answer 1

Answer №1

When passing arguments, use ++x or x++ in the format
"<p>" + (x++) + "<p/>"

Post-increment will give you a copy of the original value.

Implementation with increment operators:

var y = 0;

function constructTable(tableContent) {
  for (var x = 0; x < 2; x++) {
    window["row" + x] = tableContent[x];
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + (++y) + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Using DOM Api:

var y = 0;
function constructTable(tableContent) {
  for (var x = 0; x < tableContent.length; x++) {
    var div = document.createElement('div');
    div.innerHTML = tableContent[x];
    var elem = div.firstChild;
    elem.innerHTML = x;
    var wanted = elem.outerHTML;
    window["row" + x] = wanted;
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + y + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Applying Regex(replacing digit):

var y = 0;

function constructTable(tableContent) {
  for (var x = 0; x < 2; x++) {
    window["row" + x] = tableContent[x].replace(/\d/, x);
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + (++y) + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Answer 2

When passing arguments, use ++x or x++ in the format
"<p>" + (x++) + "<p/>"

Post-increment will give you a copy of the original value.

Implementation with increment operators:

var y = 0;

function constructTable(tableContent) {
  for (var x = 0; x < 2; x++) {
    window["row" + x] = tableContent[x];
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + (++y) + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Using DOM Api:

var y = 0;
function constructTable(tableContent) {
  for (var x = 0; x < tableContent.length; x++) {
    var div = document.createElement('div');
    div.innerHTML = tableContent[x];
    var elem = div.firstChild;
    elem.innerHTML = x;
    var wanted = elem.outerHTML;
    window["row" + x] = wanted;
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + y + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Applying Regex(replacing digit):

var y = 0;

function constructTable(tableContent) {
  for (var x = 0; x < 2; x++) {
    window["row" + x] = tableContent[x].replace(/\d/, x);
    console.log(window["row" + x]);
  }
}
constructTable(["<p>" + y + "<p/>", "<div>" + (++y) + "<div/>"]);

<script src="http://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Answer 3

Answer №2

Your example illustrates a common issue where the strings added to the array are generated when `x` is still set to `0`. Modifying `x` later on does not resolve this issue.

Here's a more complex approach that involves a separate `x` variable in both the loop and a custom "builder":

function createEntryBuilder() {
  // This `x` is distinct from the one used in the for loop.
  var x = 0;
  
  return function(tagName) {
    var tag = document.createElement(tagName);
    tag.innerHTML = x;
    x = x + 1;
    return tag;
  }
}

var builder = createEntryBuilder();

tableConstructor(["p", "div"]);

function tableConstructor (tableContent) {
    for (var x = 0; x < 2; x++) {
        var element = builder(tableContent[x]);
        window["row" + x] = element;
        console.log(window["row" + x]);
        document.body.appendChild(element);
    }
}

p { background: pink; }
div { background: khaki; }

If you want to incorporate the loop counter, consider updating it like so:

function createEntryBuilder() {
  return function(tagName, x) {
    var tag = document.createElement(tagName);
    tag.innerHTML = x;
    x = x + 1;
    return tag;
  }
}

var builder = createEntryBuilder();

tableConstructor(["p", "div"]);

function tableConstructor (tableContent) {
    for (var x = 0; x < 2; x++) {
        var element = builder(tableContent[x], x);
        window["row" + x] = element;
        console.log(window["row" + x]);
        document.body.appendChild(element);
    }
}

p { background: pink; }
div { background: khaki; }

Answer 4

Your example illustrates a common issue where the strings added to the array are generated when `x` is still set to `0`. Modifying `x` later on does not resolve this issue.

Here's a more complex approach that involves a separate `x` variable in both the loop and a custom "builder":

function createEntryBuilder() {
  // This `x` is distinct from the one used in the for loop.
  var x = 0;
  
  return function(tagName) {
    var tag = document.createElement(tagName);
    tag.innerHTML = x;
    x = x + 1;
    return tag;
  }
}

var builder = createEntryBuilder();

tableConstructor(["p", "div"]);

function tableConstructor (tableContent) {
    for (var x = 0; x < 2; x++) {
        var element = builder(tableContent[x]);
        window["row" + x] = element;
        console.log(window["row" + x]);
        document.body.appendChild(element);
    }
}

p { background: pink; }
div { background: khaki; }

If you want to incorporate the loop counter, consider updating it like so:

function createEntryBuilder() {
  return function(tagName, x) {
    var tag = document.createElement(tagName);
    tag.innerHTML = x;
    x = x + 1;
    return tag;
  }
}

var builder = createEntryBuilder();

tableConstructor(["p", "div"]);

function tableConstructor (tableContent) {
    for (var x = 0; x < 2; x++) {
        var element = builder(tableContent[x], x);
        window["row" + x] = element;
        console.log(window["row" + x]);
        document.body.appendChild(element);
    }
}

p { background: pink; }
div { background: khaki; }

Answer 5

Answer №3

Imagine utilizing a specific template, such as the one below:

function createTable (content) {
    for (var x = 0; x < content.length; x++) {
        window["row" + x] = content[x].replace("{x}",x);
        console.log(window["row" + x]);
    }
}

createTable(["<p>{x}</p>", "<div>{x}</div>", "<i>{x}</i>"]);

This method enables you to achieve something similar to this example:

createTable(["<p>hey variable x is {x}</p>", "<div>now is {x}</div>", "<i>and it changed to this {x}</i>"]);

Answer 6

Imagine utilizing a specific template, such as the one below:

function createTable (content) {
    for (var x = 0; x < content.length; x++) {
        window["row" + x] = content[x].replace("{x}",x);
        console.log(window["row" + x]);
    }
}

createTable(["<p>{x}</p>", "<div>{x}</div>", "<i>{x}</i>"]);

This method enables you to achieve something similar to this example:

createTable(["<p>hey variable x is {x}</p>", "<div>now is {x}</div>", "<i>and it changed to this {x}</i>"]);

String parameter with a variable

Answer №1

Answer №2

Answer №3

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