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Evaluating a string as a mathematical expression in JavaScript
We are required to write a JavaScript function that takes in a stringified mathematical equation. The function should return the result of the equation provided to the function.
For example: If the equation is −
const str = '1+23+4+5-30';
Then the output should be 3
Example
The code for this will be −
const str = '1+23+4+5-30';
const compute = (str = '') => {
let total = 0;
str = str.match(/[+\−]*(\.\d+|\d+(\.\d+)?)/g) || [];
while (str.length) {
total += parseFloat(str.shift());
};
return total;
};
console.log(compute(str));Output
And the output in the console will be −
3
Updated on: 21-Nov-2020
3K+ Views
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