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To remove leading zeroes in an array, use the concept of filter(). Following is our input wherein we will remove the leading zeroes −[10,0,12,0,0]) [0,0,0,0,0,0,10,12,0]) [12,0,0,1,0,0])Exampleconst removeLeadingZero = input => input.filter((lastValue => value => lastValue= lastValue || value) (false) ); console.log(removeLeadingZero([10,0,12,0,0])); console.log(removeLeadingZero([0,0,0,0,0,0,10,12,0])); console.log(removeLeadingZero([12,0,0,1,0,0]));To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo76.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo76.js [ 10, 0, 12, 0, 0 ] [ 10, 12, 0 ] [ 12, 0, 0, 1, 0, 0 ]
To change value of input, use the concept of document. The syntax is as follows −document.yourFormName.yourTextName.value=anyValue;Let’s say the following is our input type calling submitForm() on clicking “Submit Form” − The submitForm() function changing the value of input −function submitForm(){ document.studentForm.txtInput.value='STUDENT-100'; }Example Live Demo Document function submitForm(){ document.studentForm.txtInput.value='STUDENT-100'; } To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in ... Read More
If onclick not working for two or more links, then use the document.querySelectorAll() in JavaScript. Following is the code −Example Live Demo Document www.example.com www.test.com const values = document.querySelectorAll('[class=class1]'); values.forEach(function(v) { console.log(v.innerHTML); }); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
To check if the input is a number or letter, use the isNaN() function from JavaScript. It returns true if the value is NaN i.e. Not a Number. Following is the code −Example Live Demo Document Enter the value: function checkInputIsNumber(){ var value=document.forms["checkingInput"]["txtValue"].value; if (isNaN(value)){ alert("Please Provide the input as a number"); return false; } } To run the above program, save the file ... Read More
To check if array element contains a false value, you can use the Object.values() in JavaScript. Following is the code −Exampleconst details = [ { customerDetails: [ { isMarried: true }, { isMarried: true } ] }, { customerDetails: [ { isMarried: true }, { isMarried: true } ] } ] const isNotMarried = Object.values(details) .some(({customerDetails})=>customerDetails.some(({isMarried})=>!isMarrie d)); console.log(isNotMarried);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo75.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo75.js false
You need to use async and await with body onLoad attribute Following is the code −index.htmlExample Live Demo Document async function callFunction(){ await testFunction(); } function testFunction(){ console.log("Hi..."); } To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
For this, use toUpperCase() along with toLowerCase(). Following is the code −Examplefunction capitalEveryFirstletter(subjectTitle) { return subjectTitle.split(' ') .map(st => st.charAt(0).toUpperCase() + st.slice(1).toLowerCase()) .join(' ');; } var subjectTitle="iNtroduction tO JavaScript ProgRAMMINg"; var output=capitalEveryFirstletter(subjectTitle); console.log("The result="+output);To run the above program, you need to use the following command −node fileName.js.Here, my file name is demo74.js.OutputThis will produce the following output −PS C:\Users\Amit\JavaScript-code> node demo74.js The result=Introduction To JavaScript Programming
To create a global variable, you need to place variable inside the tag. Following is the code −Example Live Demo Document checkGlobalVariable var globalVariable; $(document).ready(function() { function initializeGlobalVariable() { globalVariable = [{ "name":"John", "age":23 }]; } initializeGlobalVariable(); }); function createGlobalVariable() { if (globalVariable.length) { console.log('The Global variable name ... Read More
For this, you need to use “flex-direction” concept of CSS. Let’s say the following is our CSS style − .demo{ display: flex; flex-direction: column-reverse; } Now, set the div position relative to another div −Example Live Demo Document .demo{ display: flex; flex-direction: column-reverse; } DIV_DEMO1 DIV_DEMO2 To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
You can use keyword async as well as await. Following is the code −Exampleasync function test(i) { while (i node demo73.js Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2() Call Demo1() Call Demo2()