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I want to print the following value in console,
root 1 = "The number to be printed" //
my code is
console.log("root 1 = " root1);
root1 variable contains the value of root 1, can't locate the error in my code, please help
It should be
console.log("root 1 = " + root1); //+ was missing here
You need to concatenate the variable value (root1) with the string literal "root 1 = ".
This is because as per spec when JS engine encountered the closing double quotes, it is either looking for a comma ,, a closing brace ) , operators like + - * /, or closing square bracket ] if a property is accessed.
console.log("root 1 = " , root1);
You are also missing the variable name deceleration you can't define variable name with space like "root 1" it should be like "root1", "root-1" ....
and second one is concat sign
console.log("root1" + root1);
You should remove the space between root and 1
root1 = "The number to be printed"
And also use + sign for appending:
console.log("root 1 = " + root1);
Related
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const str = 'Do. Or do not. There is no try.';
console.log(str.endsWith('try', 30)); //true
console.log(str.endsWith('try.', 30)); //false
Can anyone explain why in example 2 it is false. I think it is similar with above and must return true?
Because in endsWith() the second parameter is length.
The string
Do. Or do not. There is no try.
is 31 characters long, by setting the length parameter to 30, you're only testing
Do. Or do not. There is no try
which does not end with try.
As Ian said, you can omit the length parameter to test the entire string:
const str = 'Do. Or do not. There is no try.';
console.log(str.endsWith('try')); // false
console.log(str.endsWith('try.')); // true
It's because y is the 30th character, and in the length parameter of the function call you've specified it should test the ending of the first 30 characters of the string. Therefore it doesn't take the . (which is the 31st character) into account.
You're actually only testing the following text:
Do. Or do not. There is no try
More info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
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I am doing an exercise on concatenation.
I have a doubt, I have to print this sentence from Shakespeare "to be or nor to be".
var sentence1 = 'to be';
var sentence2 = 'or not';
console.log(sentence1 + ' ' + ' ' + sentence2 + ' ' + sentence1);
But it gives me an error:
Code is incorrect
The first string should be 'to be'
What seems to be the problem?
You can use the ES6 template literals to make it more cleaner, Try this:
const sentence1 = 'to be';
const sentence2 = 'or not';
console.log(`${sentence1} ${sentence2} ${sentence1}`);
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I have this expression:
/width*$/.test(oldStyle)
And oldStyle has this inside of it:
width:90%;height:inherit;padding-left:20px;
The expression should return true as i have tested it in a online JavaScript regex expression tool.
Why is this returning false?
Can i use this expression the way i have coded?
You need to use . to match any character followed by the * to match 1 or more.
const oldStyle = 'width:90%;height:inherit;padding-left:20px;';
const result = /width.*$/.test(oldStyle);
document.getElementById('result').innerHTML = "Result: " + result;
<div id="result"></div>
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I am building HTML in JavaScript which is working fine however I have encountered something haven't seen before and am not finding obvious solution to get past this.
I am trying to create url by concatenating string and variable but it isn't outputting "/" slashes.
I am building on the html variable which starts off creating a table:
var html = '<table class="table table-bordered">';
html += '<td>' + columns[1] + '</td>';
However this outputs everything except the "/" slashes and adds </href="https:> in place of </a>:
<a href="https: twitter.com="" toptechstaffing"="">TopTechStaffing</href="https:>
Is this not possible in JavaScript? In other languages I have seen use of backslashes to escape foreslashes so they can be presented eg "\/"
What is the "common" way of doing this in JavaScript?
Edited to add:
The columns[1] variable was a string.
Something like this?
var html = "";
html += "<td>" + columns[1] + "</td>";
This works well, assuming there is no slashes contained in column[1]
var html='<table class="table table-bordered">';
html+="<td><a href='https:\//twitter.com\/" + columns[1] + "'>"+ columns[1] + "</a></td>";
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Pretty self explanatory when you look at the following, but basically, a date string in a disabled field is pulled out. I split it by the forward slash, and I have tried everything I can think of to parse it into a number, but nothing works? I have been at this for hours. Any thoughts?
$('input[id$="ChestImagingDay5"]').val();
"8/6/2015"
$('input[id$="ChestImagingDay5"]').val().split('/')
[
0: "8",
1: "6",
2: "2015",
length: 3
]
$('input[id$="ChestImagingDay5"]').val().split('/')[0]
"8"
parseInt($('input[id$="ChestImagingDay5"]').val().split('/')[0])
NaN
parseInt($('input[id$="ChestImagingDay5"]').val().toString().split('/')[0])
NaN
parseInt($('input[id$="ChestImagingDay5"]').val().toString().split('/')[0].toString())
NaN
parseInt($('input[id$="ChestImagingDay5"]').val().toString().split('/')[0].toString(),10)
NaN
parseInt($('input[id$="ChestImagingDay5"]').val().toString().split('/')[0].toString(),'10')
NaN
Edit:
<input name="ctl00$ctl00$cphMain$plFormContent$txtChestImagingDay5" type="text" id="cphMain_plFormContent_txtChestImagingDay5" disabled="disabled" class="aspNetDisabled classTarget" style="width:94px;">
You correctly pointed out the likely problem in the comments; if you have a , it makes parseInt fail. You could strip out unprintable characters.
var parts = document.querySelector('input').value.split('/');
var int = parseInt(parts[0], 10);
console.log('Wrong Int value: ' + int); //NaN
// To make sure it works, strip out any non-printing characters.
// Got this regex from https://jsfiddle.net/shivassmca/8b0x66af/2/
// Mileage may vary, may be overkill
var re = /[\0-\x1F\x7F-\x9F\xAD\u0378\u0379\u037F-\u0383\u038B\u038D\u03A2\u0528-\u0530\u0557\u0558\u0560\u0588\u058B-\u058E\u0590\u05C8-\u05CF\u05EB-\u05EF\u05F5-\u0605\u061C\u061D\u06DD\u070E\u070F\u074B\u074C\u07B2-\u07BF\u07FB-\u07FF\u082E\u082F\u083F\u085C\u085D\u085F-\u089F\u08A1\u08AD-\u08E3\u08FF\u0978\u0980\u0984\u098D\u098E\u0991\u0992\u09A9\u09B1\u09B3-\u09B5\u09BA\u09BB\u09C5\u09C6\u09C9\u09CA\u09CF-\u09D6\u09D8-\u09DB\u09DE\u09E4\u09E5\u09FC-\u0A00\u0A04\u0A0B-\u0A0E\u0A11\u0A12\u0A29\u0A31\u0A34\u0A37\u0A3A\u0A3B\u0A3D\u0A43-\u0A46\u0A49\u0A4A\u0A4E-\u0A50\u0A52-\u0A58\u0A5D\u0A5F-\u0A65\u0A76-\u0A80\u0A84\u0A8E\u0A92\u0AA9\u0AB1\u0AB4\u0ABA\u0ABB\u0AC6\u0ACA\u0ACE\u0ACF\u0AD1-\u0ADF\u0AE4\u0AE5\u0AF2-\u0B00\u0B04\u0B0D\u0B0E\u0B11\u0B12\u0B29\u0B31\u0B34\u0B3A\u0B3B\u0B45\u0B46\u0B49\u0B4A\u0B4E-\u0B55\u0B58-\u0B5B\u0B5E\u0B64\u0B65\u0B78-\u0B81\u0B84\u0B8B-\u0B8D\u0B91\u0B96-\u0B98\u0B9B\u0B9D\u0BA0-\u0BA2\u0BA5-\u0BA7\u0BAB-\u0BAD\u0BBA-\u0BBD\u0BC3-\u0BC5\u0BC9\u0BCE\u0BCF\u0BD1-\u0BD6\u0BD8-\u0BE5\u0BFB-\u0C00\u0C04\u0C0D\u0C11\u0C29\u0C34\u0C3A-\u0C3C\u0C45\u0C49\u0C4E-\u0C54\u0C57\u0C5A-\u0C5F\u0C64\u0C65\u0C70-\u0C77\u0C80\u0C81\u0C84\u0C8D\u0C91\u0CA9\u0CB4\u0CBA\u0CBB\u0CC5\u0CC9\u0CCE-\u0CD4\u0CD7-\u0CDD\u0CDF\u0CE4\u0CE5\u0CF0\u0CF3-\u0D01\u0D04\u0D0D\u0D11\u0D3B\u0D3C\u0D45\u0D49\u0D4F-\u0D56\u0D58-\u0D5F\u0D64\u0D65\u0D76-\u0D78\u0D80\u0D81\u0D84\u0D97-\u0D99\u0DB2\u0DBC\u0DBE\u0DBF\u0DC7-\u0DC9\u0DCB-\u0DCE\u0DD5\u0DD7\u0DE0-\u0DF1\u0DF5-\u0E00\u0E3B-\u0E3E\u0E5C-\u0E80\u0E83\u0E85\u0E86\u0E89\u0E8B\u0E8C\u0E8E-\u0E93\u0E98\u0EA0\u0EA4\u0EA6\u0EA8\u0EA9\u0EAC\u0EBA\u0EBE\u0EBF\u0EC5\u0EC7\u0ECE\u0ECF\u0EDA\u0EDB\u0EE0-\u0EFF\u0F48\u0F6D-\u0F70\u0F98\u0FBD\u0FCD\u0FDB-\u0FFF\u10C6\u10C8-\u10CC\u10CE\u10CF\u1249\u124E\u124F\u1257\u1259\u125E\u125F\u1289\u128E\u128F\u12B1\u12B6\u12B7\u12BF\u12C1\u12C6\u12C7\u12D7\u1311\u1316\u1317\u135B\u135C\u137D-\u137F\u139A-\u139F\u13F5-\u13FF\u169D-\u169F\u16F1-\u16FF\u170D\u1715-\u171F\u1737-\u173F\u1754-\u175F\u176D\u1771\u1774-\u177F\u17DE\u17DF\u17EA-\u17EF\u17FA-\u17FF\u180F\u181A-\u181F\u1878-\u187F\u18AB-\u18AF\u18F6-\u18FF\u191D-\u191F\u192C-\u192F\u193C-\u193F\u1941-\u1943\u196E\u196F\u1975-\u197F\u19AC-\u19AF\u19CA-\u19CF\u19DB-\u19DD\u1A1C\u1A1D\u1A5F\u1A7D\u1A7E\u1A8A-\u1A8F\u1A9A-\u1A9F\u1AAE-\u1AFF\u1B4C-\u1B4F\u1B7D-\u1B7F\u1BF4-\u1BFB\u1C38-\u1C3A\u1C4A-\u1C4C\u1C80-\u1CBF\u1CC8-\u1CCF\u1CF7-\u1CFF\u1DE7-\u1DFB\u1F16\u1F17\u1F1E\u1F1F\u1F46\u1F47\u1F4E\u1F4F\u1F58\u1F5A\u1F5C\u1F5E\u1F7E\u1F7F\u1FB5\u1FC5\u1FD4\u1FD5\u1FDC\u1FF0\u1FF1\u1FF5\u1FFF\u200B-\u200F\u202A-\u202E\u2060-\u206F\u2072\u2073\u208F\u209D-\u209F\u20BB-\u20CF\u20F1-\u20FF\u218A-\u218F\u23F4-\u23FF\u2427-\u243F\u244B-\u245F\u2700\u2B4D-\u2B4F\u2B5A-\u2BFF\u2C2F\u2C5F\u2CF4-\u2CF8\u2D26\u2D28-\u2D2C\u2D2E\u2D2F\u2D68-\u2D6E\u2D71-\u2D7E\u2D97-\u2D9F\u2DA7\u2DAF\u2DB7\u2DBF\u2DC7\u2DCF\u2DD7\u2DDF\u2E3C-\u2E7F\u2E9A\u2EF4-\u2EFF\u2FD6-\u2FEF\u2FFC-\u2FFF\u3040\u3097\u3098\u3100-\u3104\u312E-\u3130\u318F\u31BB-\u31BF\u31E4-\u31EF\u321F\u32FF\u4DB6-\u4DBF\u9FCD-\u9FFF\uA48D-\uA48F\uA4C7-\uA4CF\uA62C-\uA63F\uA698-\uA69E\uA6F8-\uA6FF\uA78F\uA794-\uA79F\uA7AB-\uA7F7\uA82C-\uA82F\uA83A-\uA83F\uA878-\uA87F\uA8C5-\uA8CD\uA8DA-\uA8DF\uA8FC-\uA8FF\uA954-\uA95E\uA97D-\uA97F\uA9CE\uA9DA-\uA9DD\uA9E0-\uA9FF\uAA37-\uAA3F\uAA4E\uAA4F\uAA5A\uAA5B\uAA7C-\uAA7F\uAAC3-\uAADA\uAAF7-\uAB00\uAB07\uAB08\uAB0F\uAB10\uAB17-\uAB1F\uAB27\uAB2F-\uABBF\uABEE\uABEF\uABFA-\uABFF\uD7A4-\uD7AF\uD7C7-\uD7CA\uD7FC-\uF8FF\uFA6E\uFA6F\uFADA-\uFAFF\uFB07-\uFB12\uFB18-\uFB1C\uFB37\uFB3D\uFB3F\uFB42\uFB45\uFBC2-\uFBD2\uFD40-\uFD4F\uFD90\uFD91\uFDC8-\uFDEF\uFDFE\uFDFF\uFE1A-\uFE1F\uFE27-\uFE2F\uFE53\uFE67\uFE6C-\uFE6F\uFE75\uFEFD-\uFF00\uFFBF-\uFFC1\uFFC8\uFFC9\uFFD0\uFFD1\uFFD8\uFFD9\uFFDD-\uFFDF\uFFE7\uFFEF-\uFFFB\uFFFE\uFFFF]/g;
var betterInt = parseInt( parts[0].replace(re, ''), 10 );
console.log('Correct Int value: ' + betterInt); //8
<input value="8/12/07">