Is it possible to do string interpolation with list of variables?

Question

I know you can do this:

let a = 'building'; console.log(`it's a tall ${a}`);

But what about something like this:

let b = 'building'; let text = 'it's a tall $x`; console.log(text.interpolate({x: b}));

Possible duplicate of How can I do string interpolation in JavaScript? — Hassan Imam
– Hassan Imam, Commented Aug 30, 2018 at 6:23

CertainPerformance · Accepted Answer · 2018-08-30 06:30:00Z

Construct a global regular expression for each key in the passed object, and replace it with its associated value:

function escapeRegExp(string) { // https://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); } let a = 'foo'; let b = 'building'; let text = "$y $y it's a tall $x $y"; const interpolate = (input, obj) => Object.entries(obj).reduce((a, [key, replaceStr]) => ( a.replace(new RegExp(escapeRegExp('$' + key), 'g'), replaceStr) ), input); console.log(interpolate(text, {x: b, y: a}));

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